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Search: id:A049389
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| 1, 9, 90, 990, 11880, 154440, 2162160, 32432400, 518918400, 8821612800, 158789030400, 3016991577600, 60339831552000, 1267136462592000, 27877002177024000, 641171050071552000, 15388105201717248000
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OFFSET
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0,2
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FORMULA
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a(n) = (n+8)!/8!; e.g.f.: 1/(1-x)^9.
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MAPLE
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a:=n->mul(denom( (k+1)/(k+2) ), k=7..n): seq(a(n), n=6..22); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 27 2008
a:=n->mul(numer( (k+1)/(k+2) ), k=8..n): seq(a(n), n=7..23); - 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, A049388, A051379. a(n)= A051380(n, 0)*(-1)^n (first unsigned column of triangle).
Sequence in context: A036258 A098399 A082367 this_sequence A127769 A062815 A128384
Adjacent sequences: A049386 A049387 A049388 this_sequence A049390 A049391 A049392
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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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