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 A292131 #17 Sep 09 2017 12:15:40
%S A292131 1,1,0,1,-1,0,1,-2,-1,0,1,-3,-2,0,0,1,-4,-3,2,0,0,1,-5,-4,6,2,1,0,1,
%T A292131 -6,-5,12,6,6,0,0,1,-7,-6,20,12,15,-2,1,0,1,-8,-7,30,20,28,-12,2,0,0,
%U A292131 1,-9,-8,42,30,45,-36,-3,-6,0,0,1,-10,-9,56,42,66,-80
%N A292131 Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of Product_{j>=1} (1 - k*x^j).
%H A292131 Seiichi Manyama, <a href="/A292131/b292131.txt">Antidiagonals n = 0..139, flattened</a>
%e A292131 Square array begins:
%e A292131 1, 1, 1, 1, 1, ...
%e A292131 0, -1, -2, -3, -4, ...
%e A292131 0, -1, -2, -3, -4, ...
%e A292131 0, 0, 2, 6, 12, ...
%e A292131 0, 0, 2, 6, 12, ...
%Y A292131 Columns k=0..3 give A000007, A010815, A070877, A292128.
%Y A292131 Rows n=0..1 give A000012, (-1)*A001477.
%Y A292131 Main diagonal gives A292132.
%Y A292131 Cf. A246935, A286957.
%K A292131 sign,tabl
%O A292131 0,8
%A A292131 _Seiichi Manyama_, Sep 09 2017