A017169 a(n) = (9*n)^9.

0, 387420489, 198359290368, 7625597484987, 101559956668416, 756680642578125, 3904305912313344, 15633814156853823, 51998697814228992, 150094635296999121, 387420489000000000, 913517247483640899

Offset

0,2

Comments

a(n) = A155955(n,9) for n > 8. - Reinhard Zumkeller, Jan 31 2009

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..10000

Index entries for linear recurrences with constant coefficients, signature (10, -45, 120, -210, 252, -210, 120, -45, 10, -1).

Formula

a(n) = 387420489*A001017(n). - R. J. Mathar, Jul 07 2017

Mathematica

(9*Range[0, 20])^9 (* or *) LinearRecurrence[{10, -45, 120, -210, 252, -210, 120, -45, 10, -1}, {0, 387420489, 198359290368, 7625597484987, 101559956668416, 756680642578125, 3904305912313344, 15633814156853823, 51998697814228992, 150094635296999121}, 20] (* Harvey P. Dale, Dec 11 2017 *)

Prog

(Magma) [(9*n)^9: n in [0..20]]; // Vincenzo Librandi, Jul 22 2011

Crossrefs

Sequence in context: A057071 A074152 A017085 * A017385 A017505 A017637

Adjacent sequences: A017166 A017167 A017168 * A017170 A017171 A017172

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved