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 A292049 #15 Sep 08 2017 10:07:17 %S A292049 1,0,1,0,1,0,1,-1,0,1,-1,0,1,-2,0,1,-2,-1,0,1,-3,-1,0,1,-3,-2,0,1,-4, %T A292049 -3,0,1,-4,-4,1,0,1,-5,-5,1,0,1,-5,-7,2,0,1,-6,-8,3,0,1,-6,-10,5,0,1, %U A292049 -7,-12,6,1,0,1,-7,-14,9,1,0,1,-8,-16,11,2,0,1,-8,-19 %N A292049 Triangle read by rows: T(n,k) = (-1)^(k-1) * T(n-k,k-1) + T(n-k,k) with T(0,0) = 1 for 0 <= k <= A003056(n). %H A292049 Seiichi Manyama, <a href="/A292049/b292049.txt">Rows n = 0..481, flattened</a> %e A292049 First few rows are: %e A292049 1; %e A292049 0, 1; %e A292049 0, 1; %e A292049 0, 1, -1; %e A292049 0, 1, -1; %e A292049 0, 1, -2; %e A292049 0, 1, -2, -1; %e A292049 0, 1, -3, -1; %e A292049 0, 1, -3, -2; %e A292049 0, 1, -4, -3; %e A292049 0, 1, -4, -4, 1. %Y A292049 Row sums give (-1)*A278400. %Y A292049 Columns 0-1 give A000007, A000012. %Y A292049 Cf. A292047. %K A292049 sign,tabf,look %O A292049 0,14 %A A292049 _Seiichi Manyama_, Sep 08 2017