A036683 T(n+4,4) with T as in A036355.

5, 20, 71, 207, 556, 1390, 3310, 7576, 16807, 36331, 76850, 159575, 326092, 657124, 1307992, 2575180, 5020570, 9702043, 18599391, 35397328, 66918850, 125738650, 234930380, 436660010, 807690455, 1487269940, 2727149885, 4981046893

Offset

0,1

Links

Table of n, a(n) for n=0..27.

Index entries for linear recurrences with constant coefficients, signature (5,-5,-10,15,11,-15,-10,5,5,1).

Formula

G.f.: (x^4+2x^3-4x^2-5x+5)/(1-x-x^2)^5.

a(n) = A001628(n)+3*A001872(n)+A001873(n). - R. J. Mathar, Jul 03 2022

Mathematica

LinearRecurrence[{5, -5, -10, 15, 11, -15, -10, 5, 5, 1}, {5, 20, 71, 207, 556, 1390, 3310, 7576, 16807, 36331}, 30] (* Harvey P. Dale, May 26 2025 *)

Crossrefs

Sequence in context: A054889 A056384 A369818 * A054444 A121332 A122695

Adjacent sequences: A036680 A036681 A036682 * A036684 A036685 A036686

Keyword

nonn,easy

Author

Floor van Lamoen

Status

approved