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 A173131 #7 Apr 05 2016 08:42:58
%S A173131 1,2,1445,19740250,1361599599377,298514762397852026,
%T A173131 160545187370375075046277,179656719395983409634002348450,
%U A173131 373368546362937441101158606899394625
%N A173131 a(n) = (Cosh[(2n-1)ArcSinh[n]])^2.
%F A173131 a(n) ~ 2^(4*n-4) * n^(4*n-2). - _Vaclav Kotesovec_, Apr 05 2016
%t A173131 Table[Round[Cosh[(2 n - 1) ArcSinh[n]]^2], {n, 0, 10}] (* _Artur Jasinski_ *)
%Y A173131 Cf. A058331, A001079, A037270, A071253, A108741, A132592, A146311, A146312, A146313, A173115, A173116, A173121, A173127, A173128, A173129, A173130.
%K A173131 nonn
%O A173131 0,2
%A A173131 _Artur Jasinski_, Feb 10 2010