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 A129636 #7 Aug 18 2015 00:34:27 %S A129636 1,2,1,2,3,3,4,1,2,3,4,5,3,1,3,4,3,4,4,4,3,4,5,7,4,6,5,5,6,5,4,7,4,7, %T A129636 4,3,4,5,5,7,7,7,9,7,7,8,3,4,6,8,4,4,4,6,7,8,9,5,4,8,8,8,6,8,7,9,10,9, %U A129636 10,7,4,6,8,10,8 %N A129636 Triangle T(n,k): base-3 digit sum of the Pascal type triangle A102363(n,k). %F A129636 a(n) = A053735(A102363(n,k)). - R. J. Mathar, Sep 09 2011 %e A129636 ..............1......................1........................1 %e A129636 .............2.3....................2.10.....................2.1 %e A129636 ............4.5.7.................11.12.21..................2.3.3 %e A129636 ...........8.9.12.15............22.100.110.120.............4.1.2.3 %p A129636 A053735 := proc(n) add(d,d=convert(n,base,3)) ; end proc: %p A129636 A102363 := proc(n,k) if k=0 then 2^n elif k=n then 2^(n+1)-1 else procname(n-1, k)+procname(n-1, k-1) end if; end proc: %p A129636 A129636 := proc(n,k) A053735(A102363(n,k)) ; end proc: # _R. J. Mathar_, Sep 09 2011 %Y A129636 Cf. A102363. %K A129636 base,nonn,tabl %O A129636 0,2 %A A129636 David G. Williams (davidwilliams(AT)paxway.com), Jun 09 2007 %E A129636 Corrected by R. J. Mathar, Sep 09 2011