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 A010792 a(n) = n!*(n+3)! / 3!. 1

%I

%S 1,4,40,720,20160,806400,43545600,3048192000,268240896000,

%T 28970016768000,3766102179840000,579979735695360000,

%U 104396352425164800000,21714441304434278400000,5168037030455358259200000,1395369998222946729984000000,424192479459775805915136000000

%N a(n) = n!*(n+3)! / 3!.

%H Vincenzo Librandi, <a href="/A010792/b010792.txt">Table of n, a(n) for n = 0..200</a>

%H <a href="/index/Fa#factorial">Index entries for sequences related to factorial numbers</a>

%p f := n->n!*(n+3)!/3!;

%t Table[n! (n + 3)! / 3!, {n, 0, 20}] (* _Vincenzo Librandi_, Feb 25 2017 *)

%o (MAGMA) [Factorial(n)*Factorial(n+3)/6: n in [0..20]]; // _Vincenzo Librandi_, Feb 25 2017

%Y Cf. A010791.

%K nonn

%O 0,2

%A _N. J. A. Sloane_.

%E More terms from _Vincenzo Librandi_, Feb 25 2017

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Last modified April 24 09:54 EDT 2019. Contains 322420 sequences. (Running on oeis4.)