This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A001525 M5320 #25 Feb 02 2022 04:00:45
%S A001525 1,60,10080,3326400,1816214400,1482030950400,1689515283456000,
%T A001525 2564684200286208000,5001134190558105600000,
%U A001525 12182762888199545241600000,36255902355281846639001600000,129433571408356192501235712000000,545950804200446419970212233216000000
%N A001525 a(n) = (3n)!/(3!n!).
%D A001525 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A001525 T. D. Noe, <a href="/A001525/b001525.txt">Table of n, a(n) for n = 1..100</a>
%t A001525 Table[(3 n)!/(3! n!), {n, 20}] (* _Harvey P. Dale_, May 25 2011 *)
%Y A001525 Equals A064350/3!, row sums of A157704/3! and row sums of A157705/3!.
%K A001525 nonn
%O A001525 1,2
%A A001525 _N. J. A. Sloane_
%E A001525 More terms from _Harvey P. Dale_, May 25 2011