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 A195394 a(n) = (10*n)! 1
 1, 3628800, 2432902008176640000, 265252859812191058636308480000000, 815915283247897734345611269596115894272000000000, 30414093201713378043612608166064768844377641568960512000000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..5. FORMULA From Amiram Eldar, Apr 03 2021: (Start) a(n) = A000142(A008592(n)). Sum_{n>=0} 1/a(n) = A195070. Sum_{n>=0} (-1)^n/a(n) = A196498. (End) MATHEMATICA a[n_] := (10*n)!; Array[a, 6, 0] (* Amiram Eldar, Apr 03 2021 *) PROG (Magma) [Factorial(10*n): n in [0..10]] CROSSREFS Cf. A000142, A008592, A010050, A100732, A100733, A100734, A195390, A195391, A195392, A195393. Cf. A195070, A196498. Sequence in context: A172540 A071552 A181726 * A053501 A229677 A350335 Adjacent sequences: A195391 A195392 A195393 * A195395 A195396 A195397 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Sep 24 2011 STATUS approved

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Last modified May 23 18:13 EDT 2024. Contains 372765 sequences. (Running on oeis4.)