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 A278844 #4 Nov 29 2016 07:13:29
%S A278844 1,4,1409,61813936,405546824579185,444429790193462299152820,
%T A278844 87560380592182813232163111416947497,
%U A278844 3267701159348966740482726536189228228570094452288,24017165813923278639658993746183865352216465064857235206429739929
%N A278844 a(n) = permanent M_n where M_n is the n X n matrix m(i,j) = (Catalan(i+j))^2.
%t A278844 Flatten[{1, Table[Permanent[Table[CatalanNumber[i+j]^2, {i, 1, n}, {j, 1, n}]], {n, 1, 12}]}]
%Y A278844 Cf. A000108, A277829, A278770, A278843.
%K A278844 nonn
%O A278844 0,2
%A A278844 _Vaclav Kotesovec_, Nov 29 2016