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 A061930 #5 Mar 30 2012 18:51:34 %S A061930 1,0,2,0,2,4,0,1,4,8,0,0,4,8,16,0,0,4,8,16,32,0,0,3,8,16,32,64,0,0,3, %T A061930 8,16,32,64,128,0,0,1,8,16,32,64,128,256,0,0,1,8,16,32,64,128,256,512, %U A061930 0,0,1,8,16,32,64,128,256,512,1024,0,0,0,7,16,32,64,128,256,512,1024 %N A061930 Square array read by antidiagonals of T(n,k)=T(n-1,[k/2])+T(n-1,[k/3]) with T(0,0)=1. %e A061930 T(9, 7) = T(8, [7/2])+T(8, [7/3]) = T(8, 3)+T(8, 2) = 256+256 = 512. Rows start (1, 0, 0, 0, 0, ...), (2, 2, 1, 0, 0, ...), (4, 4, 4, 4, 3, ...) etc. %Y A061930 Row sums are 5^n, i.e. A000351. Each row starts with 2^n copies of 2^n, i.e. A000079 and then continues with A036561 copies of other terms in the rows of A055248. Cf. A061929. %K A061930 nonn,tabl %O A061930 0,3 %A A061930 _Henry Bottomley_, May 22 2001