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 A291954 #26 Sep 07 2017 09:07:35 %S A291954 1,0,1,0,-1,0,1,1,0,-1,-1,0,1,0,0,-1,0,1,0,1,1,-1,0,-1,-1,0,0,1,0,-1, %T A291954 0,-1,0,2,1,0,1,1,-1,-1,0,-1,-1,1,0,0,1,0,-2,-1,0,-1,0,2,1,0,1,1,-2,0, %U A291954 1,0,-1,-1,2,1,-1,0,1,0,-2,-1,0,0,-1,0,3,1,-1,0,1 %N A291954 Triangle read by rows: T(n,k) = T(n-k,k-1) - T(n-k,k) with T(0,0) = 1 for 0 <= k <= A003056(n). %H A291954 Seiichi Manyama, <a href="/A291954/b291954.txt">Rows n = 0..481, flattened</a> %F A291954 G.f. of column k: x^(k*(k+1)/2) / Product_{j=1..k} (1+x^j). %e A291954 First few rows are: %e A291954 1; %e A291954 0, 1; %e A291954 0, -1; %e A291954 0, 1, 1; %e A291954 0, -1, -1; %e A291954 0, 1, 0; %e A291954 0, -1, 0, 1; %e A291954 0, 1, 1, -1; %e A291954 0, -1, -1, 0; %e A291954 0, 1, 0, -1; %e A291954 0, -1, 0, 2, 1. %Y A291954 Row sums give A003406. %Y A291954 Columns 0-1 give A000007, A062157. %Y A291954 Cf. A008289, A291895, A291929. %K A291954 sign,tabf %O A291954 0,34 %A A291954 _Seiichi Manyama_, Sep 06 2017