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 A277353 #7 Oct 10 2016 06:21:15
%S A277353 1,4,52,1456,71344,5422144,591013696,87470027008,16881715212544,
%T A277353 4119138511860736,1239860692070081536,451309291913509679104,
%U A277353 195416923398549691052032,99271797086463243054432256,58471088483926850159060598784,39526455815134550707524964777984
%N A277353 a(n) = Product_{k=1..n} (3*k^2+1).
%F A277353 a(n) ~ 2*3^(n+1/2) * n^(2*n+1) * sinh(Pi/sqrt(3)) / exp(2*n).
%t A277353 Table[Product[3*k^2+1, {k, 1, n}], {n, 0, 15}]
%Y A277353 Cf. A101686, A277352, A277354.
%K A277353 nonn
%O A277353 0,2
%A A277353 _Vaclav Kotesovec_, Oct 10 2016