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A081917
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a(0)=1, a(n)= n^(n-2)(7n^2-3n+2)/6 (n>0).
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1
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1, 1, 4, 28, 272, 3375, 50976, 907578, 18612224, 432061533, 11200000000, 320680885976, 10051252125696, 342302635261067, 12586048547315712, 496928474121093750, 20968759865037029376, 941737183946729395897
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Main diagonal of square array defined by T(n,k)=k^n(n^3-3n^2+2n+6k^3)/(6k^3), in which rows have g.f. (1-3kx+3k^2x^2-(k^3-1)x^3)/(1-kx)^4.
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..100
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CROSSREFS
| Cf. A050407, A081913, A081914, A081915, A081916.
Sequence in context: A191686 A112915 A129683 * A174494 A128318 A032274
Adjacent sequences: A081914 A081915 A081916 * A081918 A081919 A081920
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KEYWORD
| easy,nonn
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Mar 31 2003
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