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 A303000 #11 Dec 21 2018 08:08:03
%S A303000 1,5,52,918,24630,934938,47736048,3157054776,262661665176,
%T A303000 26857133054424,3311299323349920,484541686800059760,
%U A303000 83031688670103506160,16472545369548670950480,3746065113561656467249920,968109978211279792380074880,282158259444905145777416119680
%N A303000 a(n) = permanent of the n X n matrix with entries a(i, i) = i^2 and a(i, j) = 1 elsewhere.
%H A303000 Vaclav Kotesovec, <a href="/A303000/b303000.txt">Table of n, a(n) for n = 1..36</a>
%t A303000 Table[Permanent[DiagonalMatrix[Table[i^2-1, {i, 1, n}]] + 1], {n, 1, 20}]
%o A303000 (PARI) {a(n) = matpermanent(matrix(n, n, i, j, if(i==j, i^2, 1)))}
%o A303000 for(n=1, 20, print1(a(n), ", ")) \\ _Vaclav Kotesovec_, Dec 20 2018
%Y A303000 Cf. A007840, A010791, A067550, A118714, A303001.
%K A303000 nonn
%O A303000 1,2
%A A303000 _Vaclav Kotesovec_, Apr 17 2018