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Search: id:A049388
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| 1, 8, 72, 720, 7920, 95040, 1235520, 17297280, 259459200, 4151347200, 70572902400, 1270312243200, 24135932620800, 482718652416000, 10137091700736000, 223016017416192000, 5129368400572416000
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OFFSET
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0,2
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FORMULA
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a(n) = (n+7)!/7!; e.g.f.: 1/(1-x)^8.
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MAPLE
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a:=n->mul(denom( (k+1)/(k+2) ), k=6..n): seq(a(n), n=5..21); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 27 2008
a:=n->mul(numer( (k+1)/(k+2) ), k=7..n): seq(a(n), n=6..22); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 27 2008
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CROSSREFS
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Cf. A000142, A001710, A001715, A001720, A001725, A001730, A051339. a(n)= A051379(n, 0)*(-1)^n (first unsigned column of triangle).
Sequence in context: A082414 A098411 A082366 this_sequence A014479 A013992 A129103
Adjacent sequences: A049385 A049386 A049387 this_sequence A049389 A049390 A049391
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KEYWORD
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easy,nonn
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)
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