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A025187 a(n) = T(2n,n-1), where T is the array defined in A025177. 1
1, 3, 16, 84, 459, 2552, 14378, 81783, 468622, 2700926, 15640800, 90930523, 530391615, 3102491160, 18192186330, 106901798100, 629361849402, 3711413384462, 21919199253088, 129625701167820 (list; graph; refs; listen; history; text; internal format)
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 * A151328 A277923 A076279

Adjacent sequences:  A025184 A025185 A025186 * A025188 A025189 A025190

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified January 18 11:20 EST 2021. Contains 340254 sequences. (Running on oeis4.)