A047669 Row 5 of array in A047666.

5, 26, 95, 276, 681, 1486, 2947, 5416, 9357, 15362, 24167, 36668, 53937, 77238, 108043, 148048, 199189, 263658, 343919, 442724, 563129, 708510, 882579, 1089400, 1333405, 1619410, 1952631, 2338700, 2783681, 3294086, 3876891, 4539552, 5290021, 6136762, 7088767

Offset

1,1

Links

Table of n, a(n) for n=1..35.

Index entries for linear recurrences with constant coefficients, signature (6,-15,20,-15,6,-1)

Formula

a(n) = (n/15) * (2n^4 + 30n^2 + 43).

G.f.: x*(5*x^4-4*x^3+14*x^2-4*x+5)/(x-1)^6.

Mathematica

Table[(n/15)(2n^4+30n^2+43), {n, 40}]  (* Harvey P. Dale, May 25 2023 *)

Crossrefs

Sequence in context: A301518 A350406 A362317 * A297689 A002316 A293799

Adjacent sequences: A047666 A047667 A047668 * A047670 A047671 A047672

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved