A027013 a(n) = T(2*n, n+2), T given by A027011.

1, 8, 107, 654, 2801, 9859, 30869, 89951, 250780, 680665, 1818310, 4813018, 12674542, 33283434, 87272241, 228658744, 598864479, 1568137061, 4105798635, 10749568905, 28143285770, 73680744203, 192899492252, 505018380164, 1322156411756, 3461451749404

Offset: 2

Author

Clark Kimberling

Keywords

• nonn
• easy

Links

• Colin Barker, Table of n, a(n) for n = 2..1000
• Index entries for linear recurrences with constant coefficients, signature (8,-26,45,-45,26,-8,1).

Programs

Mathematica

LinearRecurrence[{8,-26,45,-45,26,-8,1},{1,8,107,654,2801,9859,30869,89951},30] (* Harvey P. Dale, Oct 08 2018 *)

PARI

Vec(x^2*(1+69*x^2-39*x^3+36*x^4-26*x^5+8*x^6-x^7)/((1-x)^5*(1-3*x+x^2)) + O(x^40)) \\ Colin Barker, Feb 19 2016

Formula

G.f.: x^2*(1+69*x^2-39*x^3+36*x^4-26*x^5+8*x^6-x^7) / ((1-x)^5*(1-3*x+x^2)). - Colin Barker, Feb 19 2016