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 A174523 #8 May 19 2016 16:03:45 %S A174523 1,1,2,3,2,4,3,6,4,8,7,6,12,8,16,8,14,12,24,16,32,14,16,28,24,48,32, %T A174523 64,18,28,32,56,48,96,64,128,28,36,56,64,112,96,192,128,256,35,56,72, %U A174523 112,128,224,192,384,256,512,53,70,112,144,224,256 %N A174523 Triangle T(n,1) = A117989(n+1) in the first column and recursively T(n,k) = 2*T(n-1,k-1). %e A174523 1; %e A174523 1,2; %e A174523 3,2,4; %e A174523 3,6,4,8; %e A174523 7,6,12,8,16; %e A174523 8,14,12,24,16,32; %e A174523 14,16,28,24,48,32,64; %e A174523 18,28,32,56,48,96,64,128; %e A174523 28,36,56,64,112,96,192,128,256; %e A174523 35,56,72,112,128,224,192,384,256,512; %p A174523 A174523 := proc(n,k) %p A174523 option remember; %p A174523 if k = 1 then %p A174523 A117989(n+1) ; %p A174523 elif k > n then %p A174523 0; %p A174523 else %p A174523 2*procname(n-1,k-1) ; %p A174523 end if; %p A174523 end proc: # _R. J. Mathar_, May 19 2016 %Y A174523 Cf. A056823 (row sums). %K A174523 easy,nonn,tabl %O A174523 1,3 %A A174523 _Alford Arnold_, Mar 30 2010 %E A174523 Edited by _R. J. Mathar_, May 17 2016