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 A103481 #2 Mar 30 2012 18:59:03
%S A103481 1,1,2,3,4,6,9,16,31,69,168,447,1274,3862,12351,41472,145661,533745,
%T A103481 2036158,8071795,33192800,141351726,622384741,2829417288,13263528363,
%U A103481 64038928741,318121600708,1624347614751,8517247764150,45822087138894
%N A103481 Diagonal sums of A103462.
%F A103481 a(n)=sum{k=0..floor(n/2), k^(n-2k)+1-0^(n-2k)}; a(n)=sum{k=0..floor(n/2), k^(n-2k)}+floor((n+1)/2).
%K A103481 easy,nonn
%O A103481 0,3
%A A103481 _Paul Barry_, Feb 07 2005