A025256 -id:A025256

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A025257

(1/3)*s(n+3), where s = A025256.

+20
0

1, 2, 6, 14, 35, 97, 264, 727, 2059, 5876, 16893, 49085, 143639, 422764, 1251642, 3724276, 11129680, 33393998, 100560903, 303812039, 920617337, 2797335154, 8521230447, 26017690537, 79610304979, 244082395820, 749739211746, 2306942230064

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..28.

FORMULA

G.f.: (1-x-x^2-6*x^3-sqrt(1-2*x-x^2-10*x^3+x^4))/x^3/6. - Vladeta Jovovic, May 07 2003

Conjecture: (n+3)*a(n) +(-2*n-3)*a(n-1) -n*a(n-2) +5*(-2*n+3)*a(n-3) +(n-3)*a(n-4)=0. - R. J. Mathar, Feb 25 2015

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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