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 A023558 #3 Mar 30 2012 18:55:52 %S A023558 0,1,3,4,8,14,22,36,59,97,156,253,409,663,1074,1737,2811,4548,7359, %T A023558 11908,19269,31177,50446,81623,132069,213692,345762,559456,905218, %U A023558 1464674,2369892,3834566,6204458 %N A023558 Convolution of A023531 and Lucas numbers. %K A023558 nonn %O A023558 1,3 %A A023558 _Clark Kimberling_