A054129 T(n,3), array T as in A054126.

2, 9, 39, 134, 394, 1040, 2542, 5876, 13039, 28080, 59163, 122694, 251576, 511720, 1035068, 2085640, 4191629, 8409592, 16852833, 33748170, 67549470, 135164720, 270410170, 540918620, 1081955995, 2164054496

Offset: 3

Author

Clark Kimberling

Keywords

• nonn

Links

• Index entries for linear recurrences with constant coefficients, signature (8, -27, 50, -55, 36, -13, 2).

Formula

G.f.: x^3(-x^7+7x^6-21x^5+35x^4-35x^3+21x^2-7x+2)/[(1-2x)(1-x)^6].