A071551 a(n) = (9n)!/n!^9.

1, 362880, 12504636144000, 1080491954750208000000, 140810154080474667338550000000, 23183587808948692737291767860055162880, 4439413043841128802009762476941510771390464000, 944848320304251231447932170080297903208364959334400000, 217425846656446788579638892849417587480505167467321080630000000

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..100

Formula

a(n) ~ 3^(18*n+1) / (2*Pi*n)^4. - Amiram Eldar, Oct 17 2025

Mathematica

Table[(9n)!/(n)!^9, {n, 0, 20}] (* Vincenzo Librandi, Aug 13 2014 *)

Prog

(Magma) [Factorial(9*n)/Factorial(n)^9: n in [0..20]]; // Vincenzo Librandi, Aug 13 2014

Crossrefs

Sequences (k*n)!/n!^k: A000984 (k = 2), A006480 (k = 3), A008977 (k = 4), A008978 (k = 5), A008979 (k = 6), A071549 (k = 7), A071550 (k = 8), A071552 (k = 10).

Sequence in context: A227671 A172536 A287085 * A181725 A195393 A229676

Adjacent sequences: A071548 A071549 A071550 * A071552 A071553 A071554

Keyword

nonn,easy

Author

Benoit Cloitre, May 30 2002

Status

approved