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 A152038 #6 Sep 08 2013 13:31:30
%S A152038 1,2,3,6,11,12,22,42,51,56,107,170,201,272,385,476,653,1042,1433,1590,
%T A152038 1602,2386,4280,5644,5508,6110,9217,13324,17315,19512,19690,25990,
%U A152038 43918,59982,61931,57374
%N A152038 Convolution of A039599 with itself .
%o A152038 (PARI) lista(nn) = {v = vector((nn+1)*(nn+2)/2); iv = 0; for (n=0, nn, for (k=0, n, v[iv++] = (2*k+1)*binomial(2*n, n-k)/(n+k+1););); n = #v; for (i=1, n, print1(sum(k=1, i, v[k]*v[i-k+1]), ", "););} \\ _Michel Marcus_, Jun 02 2013
%Y A152038 Cf. A039599
%K A152038 nonn
%O A152038 0,2
%A A152038 _Philippe Deléham_, Nov 20 2008
%E A152038 More terms from _Michel Marcus_, Jun 02 2013