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 A026080 #4 Mar 30 2012 18:56:04
%S A026080 1,2,4,7,22,64,191,567,1689,5033,15013,44809,133816,399802,1194949,
%T A026080 3572693,10684758,31962456,95633229,286193409,856610214,2564317356,
%U A026080 7677475521,22988860305,68843627049,206183053485,617563017927,1849887488987
%N A026080 Sum{T(n,k)}, k = 0,1,...,n, where T is the array defined in A024996.
%Y A026080 First differences of A027914.
%K A026080 nonn
%O A026080 0,2
%A A026080 _Clark Kimberling_