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 A124996 #20 Jan 07 2021 10:32:16
%S A124996 1,6,44,426,4658,55260,689508,8914872,118374410,1604658420,
%T A124996 22115171280,308940507202,4364729023812,62256518307724,
%U A124996 895294865045296,12966655239260890,188967013096930258,2769003814616561636,40773380119956434784,603008173331642200144
%N A124996 a(n) is the constant term in the expansion of Product_{k=1..n} (x^k + 1/x^k)^4.
%H A124996 Ray Chandler, <a href="/A124996/b124996.txt">Table of n, a(n) for n = 0..834</a> (terms < 10^1000)
%F A124996 a(n) ~ sqrt(3) * 16^n / (sqrt(2*Pi) * n^(3/2)). - _Vaclav Kotesovec_, Jan 07 2021
%o A124996 (PARI) a(n) = polcoef(prod(k=1, n, (x^k + 1/x^k)^4), 0); \\ _Michel Marcus_, Jan 07 2021
%Y A124996 For constant term in expansion of Product_{k=1..n} (x^k + 1/x^k)^q for other values of q see A063865, A047653, A124995.
%K A124996 nonn
%O A124996 0,2
%A A124996 _N. J. A. Sloane_, Jul 12 2008