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 A133938 #8 Mar 23 2022 07:38:49 %S A133938 1,2,1,4,2,1,7,4,4,1,11,8,11,4,1,16,15,25,11,6,1,22,26,50,26,22,6,1, %T A133938 29,42,91,56,63,22,8,1,37,64,154,112,154,64,37,8,1,46,93,24,210,336, %U A133938 162,129,37,10,1 %N A133938 A007318 * (A129686 + A133080 - I), where I is the identity matrix. %C A133938 Left column = A000124: (1, 2, 4, 7, 11, ...). %C A133938 Row sums = A133124: (1, 3, 7, 16, 35, 74, ...). %F A133938 Binomial transform of matrix M, where M = a tridiagonal matrix with (1,1,1,...) in the main diagonal, (1,0,1,0,...) in the subdiagonal and (1,1,1,...) in the subsubdiagonal. M = (A129686 + A133080 - I), I = Identity matrix. %e A133938 First few rows of the triangle: %e A133938 1; %e A133938 2, 1; %e A133938 4, 2, 1; %e A133938 7, 4, 4, 1; %e A133938 11, 8, 11, 4, 1; %e A133938 16, 15, 25, 11, 6, 1; %e A133938 22, 26, 50, 26, 22, 6, 1; %e A133938 ... %Y A133938 Cf. A000124, A133124, A129686, A133080. %K A133938 nonn,tabl,more %O A133938 1,2 %A A133938 _Gary W. Adamson_, Sep 29 2007