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 A107065 #9 Feb 21 2024 08:18:46 %S A107065 1,1,1,1,2,1,1,3,3,1,1,4,6,4,1,1,4,10,10,5,1,1,4,13,20,15,6,1,1,4,15, %T A107065 32,35,21,7,1,1,4,16,44,66,56,28,8,1,1,4,16,54,106,121,84,36,9,1,1,4, %U A107065 16,60,150,222,204,120,45,10,1,1,4,16,63,190,357,420,323,165,55,11,1,1,4,16 %N A107065 Riordan array (1/(1-x),x(1+x+x^2+x^3)). %C A107065 Row sums are A107066. Diagonal sums are A023436(n+1). %e A107065 Triangle begins %e A107065 1; %e A107065 1, 1; %e A107065 1, 2, 1; %e A107065 1, 3, 3, 1; %e A107065 1, 4, 6, 4, 1; %e A107065 1, 4, 10, 10, 5, 1; %e A107065 1, 4, 13, 20, 15, 6, 1; %e A107065 ... %Y A107065 Cf. A107066, A023436. %K A107065 easy,nonn,tabl %O A107065 0,5 %A A107065 _Paul Barry_, May 10 2005