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 A144659 #2 Mar 30 2012 16:51:00
%S A144659 0,0,3,60,990,16485,292215,5602338,116549370,2627202105,63960690420,
%T A144659 1675359272730,47031228602358,1409683851264780,44956320071089245,
%U A144659 1520493296271210030,54376042036599780570,2050556012681642525763,81336729496634645414265,3385729099078381669910310
%N A144659 a(n) = A001516(n)/2.
%F A144659 Also a(n) = 3*A144507(n).
%F A144659 Also a(n) = Sum_{k} binomial(k-n,2) T(n,k) where T(n,k) is the triangle in A144331.
%K A144659 nonn
%O A144659 0,3
%A A144659 _N. J. A. Sloane_, Jan 30 2009