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Search: id:A122832
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| A122832 |
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Exponential Riordan array (e^(x(1+x)),x). |
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+0
2
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| 1, 1, 1, 3, 2, 1, 7, 9, 3, 1, 25, 28, 18, 4, 1, 81, 125, 70, 30, 5, 1, 331, 486, 375, 140, 45, 6, 1, 1303, 2317, 1701, 875, 245, 63, 7, 1, 5937, 10424, 9268, 4536, 1750, 392
(list; table; graph; listen)
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OFFSET
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0,4
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COMMENT
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Row sums are A000898. Inverse is A122833. Product of A007318 and A067147.
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FORMULA
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Number triangle T(n,k)=(n!/k!)sum{i=0..n-k, C(i,n-k-i)/i!}
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EXAMPLE
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Triangle begins
1,
1, 1,
3, 2, 1,
7, 9, 3, 1,
25, 28, 18, 4, 1,
81, 125, 70, 30, 5, 1
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CROSSREFS
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Sequence in context: A130462 A059380 A145035 this_sequence A056151 A134436 A163626
Adjacent sequences: A122829 A122830 A122831 this_sequence A122833 A122834 A122835
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Sep 12 2006
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