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 A286656 #22 May 14 2017 04:32:39
%S A286656 1,1,0,1,-1,0,1,-1,0,0,1,-1,-1,-1,0,1,-1,-1,1,1,0,1,-1,-1,0,-1,-1,0,1,
%T A286656 -1,-1,0,1,0,1,0,1,-1,-1,0,0,0,2,-1,0,1,-1,-1,0,0,2,-1,-1,2,0,1,-1,-1,
%U A286656 0,0,1,-1,1,-1,-2,0,1,-1,-1,0,0,1,1,0,2,3,2,0,1
%N A286656 Square array A(n,k), n>=0, k>=1, read by antidiagonals, where column k is the expansion of Product_{j>=1} (1 - x^j)/(1 - x^(k*j)).
%F A286656 G.f. of column k: Product_{j>=1} (1 - x^j)/(1 - x^(k*j)).
%e A286656 Square array begins:
%e A286656 1, 1, 1, 1, 1, ...
%e A286656 0, -1, -1, -1, -1, ...
%e A286656 0, 0, -1, -1, -1, ...
%e A286656 0, -1, 1, 0, 0, ...
%e A286656 0, 1, -1, 1, 0, ...
%Y A286656 Columns k=1-5 give: A000007, A081362, A137569, A082303, A145466.
%Y A286656 Main diagonal gives A010815.
%Y A286656 Cf. A286653.
%K A286656 sign,tabl
%O A286656 0,43
%A A286656 _Seiichi Manyama_, May 14 2017