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 A132823 #11 Mar 06 2022 00:14:03 %S A132823 1,1,1,1,0,1,1,1,1,1,1,2,4,2,1,1,3,8,8,3,1,1,4,13,18,13,4,1,1,5,19,33, %T A132823 33,19,5,1,1,6,26,54,68,54,26,6,1,1,7,34,82,124,124,82,34,7,1,1,8,43, %U A132823 118,208,250,208,118,43,8,1,1,9,53,163,328,460,460,328,163,53,9,1 %N A132823 A007318 + 2*A103451 - 2*A000012. %C A132823 Row sums = A132824: (1, 2, 2, 4, 10, 24, 54, 116, 242, ...). %F A132823 A007318 + 2*A103451 - 2*A000012 as infinite lower triangular matrices. %e A132823 First few rows of the triangle: %e A132823 1; %e A132823 1, 1; %e A132823 1, 0, 1; %e A132823 1, 1, 1, 1; %e A132823 1, 2, 4, 2, 1; %e A132823 1, 3, 8, 8, 3, 1; %e A132823 1, 4, 13, 18, 13, 4, 1; %e A132823 1, 5, 19, 33, 33, 19, 5, 1; %e A132823 1, 6, 26, 54, 68, 54, 26, 6, 1; %e A132823 1, 7, 34, 82, 124, 124, 82, 34, 7, 1; %e A132823 ... %Y A132823 Cf. A007318, A103451, A000012, A132824. %Y A132823 A(2n,n) gives A115112 for n>0. %K A132823 nonn,tabl %O A132823 0,12 %A A132823 _Gary W. Adamson_, Sep 02 2007 %E A132823 One missing 1 inserted and more terms added by _Alois P. Heinz_, Feb 10 2019