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Search: id:A093420
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| A093420 |
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Triangle read by rows: for 1 <= k <= n, numerator of a(n, k) = [prod_{i = 0..k-1} n-i]/[sum_{i = 1..k} i]. |
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4
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| 1, 2, 2, 3, 2, 1, 4, 4, 4, 12, 5, 20, 10, 12, 8, 6, 10, 20, 36, 48, 240, 7, 14, 35, 84, 168, 240, 180, 8, 56, 56, 168, 448, 960, 1440, 1120, 9, 24, 84, 1512, 1008, 2880, 6480, 10080, 8064, 10, 30, 120, 504, 2016, 7200, 21600, 50400, 80640, 725760, 11, 110, 165
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(n, n) = 2*(n-1)!/(n+1).
A093421 gives the denominators.
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CROSSREFS
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Cf. A093412, A093421, A093422.
Sequence in context: A162915 A092565 A021452 this_sequence A104897 A097510 A156747
Adjacent sequences: A093417 A093418 A093419 this_sequence A093421 A093422 A093423
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KEYWORD
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nonn,easy,frac,tabl,less
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 30 2004
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EXTENSIONS
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Edited and extended by David Wasserman (dwasserm(AT)earthlink.net), Aug 29 2006
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