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 A292143 #14 Sep 17 2017 03:55:58 %S A292143 1,0,1,0,1,0,1,-4,0,1,-4,0,1,-8,0,1,-8,-4,0,1,-12,-4,0,1,-12,-8,0,1, %T A292143 -16,-12,0,1,-16,-16,16,0,1,-20,-20,16,0,1,-20,-28,32,0,1,-24,-32,48, %U A292143 0,1,-24,-40,80,0,1,-28,-48,96,16,0,1,-28,-56,144,16,0,1,-32 %N A292143 Triangle read by rows: T(n,k) = (-4)^(1 - k mod 2) * T(n-k,k-1) + T(n-k,k) with T(0,0) = 1 for 0 <= k <= A003056(n). %H A292143 Seiichi Manyama, <a href="/A292143/b292143.txt">Rows n = 0..481, flattened</a> %e A292143 First few rows are: %e A292143 1; %e A292143 0, 1; %e A292143 0, 1; %e A292143 0, 1, -4; %e A292143 0, 1, -4; %e A292143 0, 1, -8; %e A292143 0, 1, -8, -4; %e A292143 0, 1, -12, -4; %e A292143 0, 1, -12, -8; %e A292143 0, 1, -16, -12; %e A292143 0, 1, -16, -16, 16. %Y A292143 Row sums give A292141. %Y A292143 Columns 0-1 give A000007, A000012. %Y A292143 Cf. A292049. %K A292143 sign,tabf %O A292143 0,8 %A A292143 _Seiichi Manyama_, Sep 09 2017