A113443 Fourth row of A113439.

1, 5, 23, 101, 436, 1871, 8014, 34309, 146868, 628708, 2691401, 11521603, 49323052, 211148530, 903912916, 3869592721, 16565477544, 70915744968, 303585747088, 1299631069856, 5563637060865, 23817572559345, 101961496787621

Offset

0,2

Links

G. C. Greubel, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (9,-28,38,-20,1).

Formula

a(n) = A113439(4*n+3).

a(n) = 9*a(n-1) - 28*a(n-2) + 38*a(n-3) - 20*a(n-4) + a(n-5).

G.f.: -(1-4*x+6*x^2-4*x^3+x^4)/(-1+9*x-28*x^2+38*x^3-20*x^4+x^5).

Mathematica

CoefficientList[Series[-(1 - 4*x + 6*x^2 - 4*x^3 + x^4)/(-1 + 9*x - 28*x^2 + 38*x^3 - 20*x^4 + x^5), {x, 0, 50}], x] (* G. C. Greubel, Mar 11 2017 *)

Prog

(PARI) x='x+O('x^50); Vec(-(1-4*x+6*x^2-4*x^3+x^4)/(-1+9*x-28*x^2 +38*x^3 -20*x^4+x^5)) \\ G. C. Greubel, Mar 11 2017

Crossrefs

Cf. A113439.

Sequence in context: A229008 A274322 A085350 * A124999 A258431 A356340

Adjacent sequences: A113440 A113441 A113442 * A113444 A113445 A113446

Keyword

nonn,easy

Author

Floor van Lamoen, Nov 04 2005

Status

approved