A025187 a(n) = T(2n,n-1), where T is the array defined in A025177.

1, 3, 16, 84, 459, 2552, 14378, 81783, 468622, 2700926, 15640800, 90930523, 530391615, 3102491160, 18192186330, 106901798100, 629361849402, 3711413384462, 21919199253088, 129625701167820

Offset

1,2

Links

Table of n, a(n) for n=1..20.

Formula

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

Maple

A025187 := proc(n)
        A025177(2*n+1, n) ;
end proc: # R. J. Mathar, Jul 28 2016

Crossrefs

Sequence in context: A275402 A026131 A026160 * A373277 A151328 A277923

Adjacent sequences: A025184 A025185 A025186 * A025188 A025189 A025190

Keyword

nonn

Author

Clark Kimberling

Status

approved