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Search: id:A135091
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| 1, 1, 1, 1, 2, 3, 1, 3, 9, 7, 1, 4, 18, 28, 19, 1, 5, 30, 70, 95, 51, 1, 6, 45, 140, 285, 306, 141, 1, 7, 63, 245, 665, 1071, 987, 393, 1, 8, 84, 392, 1330, 2856, 3948, 3144, 1107, 1, 9, 108, 588, 2394, 6426, 11844, 14148, 9963, 3139
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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Right border = A002426. Row sums = A000984: (1, 2, 6, 20, 70, 252,...).
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FORMULA
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A007318 * triangle M, where M = A002426 * 0^(n-k), 0<=k<=n; i.e. M = an infinite lower triangular matrix with A002426 as the right border and the rest zeros.
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EXAMPLE
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First few rows of the triangle are:
1;
1, 1;
1, 2, 3;
1, 3, 9, 7;
1, 4, 18, 28, 19;
1, 5, 30, 70, 95, 51;
1, 6, 45, 140, 285, 306, 141;
1, 7, 63, 245, 665, 1071, 987, 393;
...
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CROSSREFS
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Cf. A002426, A000984.
Sequence in context: A139633 A152440 A134319 this_sequence A171150 A111589 A010027
Adjacent sequences: A135088 A135089 A135090 this_sequence A135092 A135093 A135094
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Nov 18 2007
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