A198478 - OEIS

A198478

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

0, 9, 41472, 14348907, 1719926784, 115330078125, 5355700839936, 193010051319183, 5777633090469888, 150094635296999121, 3486784401000000000, 73994897046174912819, 1457274373159131021312, 26955214582765006137717

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

FORMULA

G.f.: 9*x*(1 + 4518*x + 1183248*x^2 + 64322586*x^3 + 1024762590*x^4 + 5210129466*x^5 + 7763290128*x^6 + 2401050438*x^7 + 43046721*x^8)/(1 - 9*x)^10. - Colin Barker, Apr 30 2013

a(n) = A001019(n)*A001017(n). - Michel Marcus, May 18 2022

MATHEMATICA

Table[9^n*n^9, {n, 0, 20}] (* G. C. Greubel, May 17 2022 *)

PROG

(Magma) [9^n*n^9: n in [0..20]]

(SageMath) [9^n*n^9 for n in (0..20)] # G. C. Greubel, May 17 2022

CROSSREFS

Cf. A001017, A001019.

Cf. A007758, A062074, A062075, A097206, A098803, A098880.

Sequence in context: A297563 A234641 A242853 * A159398 A321581 A053971

Adjacent sequences: A198475 A198476 A198477 * A198479 A198480 A198481

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Oct 27 2011

STATUS

approved