A195394 a(n) = (10*n)!

1, 3628800, 2432902008176640000, 265252859812191058636308480000000, 815915283247897734345611269596115894272000000000, 30414093201713378043612608166064768844377641568960512000000000000

Offset: 0

Author

Vincenzo Librandi, Sep 24 2011

Keywords

• nonn
• easy

Crossrefs

Cf. A000142, A008592, A010050, A100732, A100733, A100734, A195390, A195391, A195392, A195393.

Cf. A195070, A196498.

Programs

Magma

[Factorial(10*n): n in [0..10]];

Mathematica

a[n_] := (10*n)!; Array[a, 6, 0] (* Amiram Eldar, Apr 03 2021 *)
(10*Range[0,10])! (* Harvey P. Dale, Aug 04 2025 *)

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)