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 A025187 #9 Jul 28 2016 15:35:20 %S A025187 1,3,16,84,459,2552,14378,81783,468622,2700926,15640800,90930523, %T A025187 530391615,3102491160,18192186330,106901798100,629361849402, %U A025187 3711413384462,21919199253088,129625701167820 %N A025187 a(n) = T(2n,n-1), where T is the array defined in A025177. %F A025187 Conjecture: +12*n*(1573*n-2085)*(3*n-1)*(3*n+1)*a(n) +(259519*n^4-6550685*n^3+19840883*n^2-20466403*n+6720078)*a(n-1) -54*(2*n-3)*(63141*n^3-343882*n^2+645379*n-388606)*a(n-2) -324*(n-3)*(4693*n-5417)*(2*n-3)*(2*n-5)*a(n-3)=0. - _R. J. Mathar_, Feb 25 2015 %p A025187 A025187 := proc(n) %p A025187 A025177(2*n+1,n) ; %p A025187 end proc: # _R. J. Mathar_, Jul 28 2016 %K A025187 nonn %O A025187 1,2 %A A025187 _Clark Kimberling_