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 A118802 #3 Mar 30 2012 18:36:57
%S A118802 1,2,11,76,565,4406,35455,291264,2427113,20436202,173435251,
%T A118802 1481052596,12711044125,109543953182,947334302951,8216780507176,
%U A118802 71450654876625,622692860482514,5437356743763163,47561030194674972,416661242790844421
%N A118802 Row squared sums of triangle A118801: a(n) = Sum_{k=0..n} A118801(n,k)^2.
%C A118802 Self-convolution of A118803.
%o A118802 (PARI) {a(n)=sum(k=0,n,(1+(-1)^k*2^(n-k+1)*sum(j=0,k\2,binomial(n-2*j-2,k-2*j-1)))^2)}
%Y A118802 Cf. A118801, A118803.
%K A118802 nonn
%O A118802 0,2
%A A118802 _Paul D. Hanna_, May 02 2006