A017631 a(n) = (12*n+9)^3.

729, 9261, 35937, 91125, 185193, 328509, 531441, 804357, 1157625, 1601613, 2146689, 2803221, 3581577, 4492125, 5545233, 6751269, 8120601, 9663597, 11390625, 13312053, 15438249, 17779581, 20346417

Offset

0,1

Links

Table of n, a(n) for n=0..22.

Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1).

Formula

G.f. 27*(27+235*x+121*x^2+x^3)/(x-1)^4. a(n) = 27*A016839(n). - R. J. Mathar, Dec 03 2015

Mathematica

(12*Range[0, 30]+9)^3 (* or *) LinearRecurrence[{4, -6, 4, -1}, {729, 9261, 35937, 91125}, 30] (* Harvey P. Dale, Apr 06 2016 *)

Prog

(PARI) a(n) = (12*n+9)^3; \\ Altug Alkan, Dec 03 2015

Crossrefs

Sequence in context: A034991 A017499 A269057 * A209508 A016758 A183809

Adjacent sequences: A017628 A017629 A017630 * A017632 A017633 A017634

Keyword

nonn,easy

Author

N. J. A. Sloane.

Status

approved