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

2,2

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).

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

Mathematica

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

Prog

(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

Crossrefs

Sequence in context: A345474 A000845 A199658 * A365818 A239985 A274892

Adjacent sequences: A027010 A027011 A027012 * A027014 A027015 A027016

Keyword

nonn,easy

Author

Clark Kimberling

Status

approved