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 A291955 #13 Sep 06 2017 14:16:56 %S A291955 1,0,1,0,0,0,0,1,0,-1,0,0,0,0,0,0,-1,1,0,1,0,0,0,0,-1,0,0,1,1,-1,0,-1, %T A291955 0,0,1,0,0,2,-1,0,0,-2,-1,1,0,0,1,1,-1,-1,0,-1,-3,2,0,0,3,2,-1,-1,1,0, %U A291955 -2,-3,2,1,0,0,3,4,-3,-1,0,0,-4,-4,3,2,-1,0,4 %N A291955 Triangle read by rows: T(n,k) = T(n-k,k-1) - T(n-k,k+1) with T(0,0) = 1 for 0 <= k <= A003056(n). %H A291955 Seiichi Manyama, <a href="/A291955/b291955.txt">Rows n = 0..481, flattened</a> %e A291955 First few rows are: %e A291955 1; %e A291955 0, 1; %e A291955 0, 0; %e A291955 0, 0, 1; %e A291955 0, -1, 0; %e A291955 0, 0, 0; %e A291955 0, 0, -1, 1; %e A291955 0, 1, 0, 0; %e A291955 0, 0, -1, 0; %e A291955 0, 1, 1, -1; %e A291955 0, -1, 0, 0, 1. %Y A291955 Row sums give A291956. %Y A291955 Columns 0-1 give A000007, A049346. %Y A291955 Cf. A291904. %K A291955 sign,tabf %O A291955 0,38 %A A291955 _Seiichi Manyama_, Sep 06 2017