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 A173130 #6 Apr 05 2016 08:39:18
%S A173130 0,1,26,3363,937444,456335045,343904160606,371198523608647,
%T A173130 543466014742175624,1036834190110356583689,2499384905955651114739810,
%U A173130 7429238104512325157021090411,26695718139185294187938997247212
%N A173130 a(n) = Cosh[(2 n - 1) ArcCosh[n]].
%F A173130 a(n) ~ 2^(2*n-2) * n^(2*n-1). - _Vaclav Kotesovec_, Apr 05 2016
%t A173130 Table[Round[Cosh[(2 n - 1) ArcCosh[n]]], {n, 0, 20}] (* _Artur Jasinski_ *)
%Y A173130 Cf. A058331, A001079, A037270, A071253, A108741, A132592, A146311, A146312, A146313, A173115, A173116, A173121, A173127, A173128.
%K A173130 nonn
%O A173130 0,3
%A A173130 _Artur Jasinski_, Feb 10 2010