A131176 a(n) = (n^5-n-10)/10.

-1, -1, 2, 23, 101, 311, 776, 1679, 3275, 5903, 9998, 16103, 24881, 37127, 53780, 75935, 104855, 141983, 188954, 247607, 319997, 408407, 515360, 643631, 796259, 976559, 1188134, 1434887, 1721033, 2051111, 2429996, 2862911, 3355439, 3913535, 4543538, 5252183, 6046613, 6934391

Offset

0,3

Links

Table of n, a(n) for n=0..37.

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

Formula

a(n) = ((n^5 - n - 1) - 9)/10.

G.f.: (-1+5*x-7*x^2+16*x^3-2*x^4+x^5)/(-1+x)^6. - R. J. Mathar, Nov 14 2007

Mathematica

Table[((n^5 - n - 1) - 9)/10, {n, 0, 100}]
LinearRecurrence[{6, -15, 20, -15, 6, -1}, {-1, -1, 2, 23, 101, 311}, 40] (* Harvey P. Dale, Dec 17 2024 *)

Crossrefs

Cf. A126426, A134327.

Sequence in context: A238185 A053999 A357739 * A141405 A068876 A073175

Adjacent sequences: A131173 A131174 A131175 * A131177 A131178 A131179

Keyword

sign,easy

Author

Artur Jasinski, Oct 20 2007

Status

approved