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 A100734 a(n) = (5*n)!. 10
 1, 120, 3628800, 1307674368000, 2432902008176640000, 15511210043330985984000000, 265252859812191058636308480000000, 10333147966386144929666651337523200000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..90 FORMULA E.g.f.: 1/(1-x^5). From Ilya Gutkovskiy, Jan 20 2017: (Start) a(n) ~ sqrt(2*Pi)*5^(5*n+1/2)*n^(5*n+1/2)/exp(5*n). Sum_{n>=0} 1/a(n) = A269296. (End) MATHEMATICA (5*Range[0, 10])! (* Harvey P. Dale, May 06 2015 *) PROG (MAGMA) [Factorial(5*n): n in [0..10]]; // Vincenzo Librandi, Sep 24 2011 CROSSREFS Cf. A000142, A010050, A100732, A100733, A268506, A269296. Sequence in context: A172857 A172897 A258925 * A115463 A003922 A210279 Adjacent sequences:  A100731 A100732 A100733 * A100735 A100736 A100737 KEYWORD nonn,easy AUTHOR Ralf Stephan, Dec 08 2004 STATUS approved

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