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 A174890 #9 Jan 25 2023 17:50:56
%S A174890 1,0,1,0,196,0,65028096,0,1540115470208876544,0,
%T A174890 861787404007697994335390269440000,0,
%U A174890 3024149801599872168810739614376506649075557335040000,0,25610879735369429335666530857036523659955793212506655095941286757767577600000000
%N A174890 a(n) = det(M) where M is an n X n matrix with M[i,j] = i^j - j^i.
%F A174890 a(2n) = A071410(n), a(2n+1) = 0. - _Alois P. Heinz_, Jan 25 2023
%t A174890 f[n_] := Table[i^j - j^i, {i, 1, n}, {j, 1, n}]; Table[Det[f[n]], {n, 1, 15}]
%Y A174890 Cf. A071410.
%K A174890 nonn
%O A174890 0,5
%A A174890 _José María Grau Ribas_, Apr 01 2010
%E A174890 a(0)=1 prepended by _Alois P. Heinz_, Jan 25 2023