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A295473 a(0) = 0; for n>0, a(n) = 9*n!. 1
0, 9, 18, 54, 216, 1080, 6480, 45360, 362880, 3265920, 32659200, 359251200, 4311014400, 56043187200, 784604620800, 11769069312000, 188305108992000, 3201186852864000, 57621363351552000, 1094805903679488000, 21896118073589760000, 459818479545384960000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..300

FORMULA

E.g.f.: 9*x/(1-x).

a(n) = n*a(n-1) = 9*A000142(n) for n>0.

MATHEMATICA

Join[{0}, 9 Range[25]!]

PROG

(Magma) [n eq 0 select 0 else 9*Factorial(n): n in [0..25]];

(PARI) a(n) = (n > 0)*9*n! \\ Felix Fröhlich, Feb 15 2018

CROSSREFS

Cf. A000142.

Cf. similar sequences listed in A298881.

Sequence in context: A022669 A107313 A232921 * A255839 A166640 A140149

Adjacent sequences:  A295470 A295471 A295472 * A295474 A295475 A295476

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Feb 14 2018

STATUS

approved

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Last modified October 5 23:01 EDT 2022. Contains 357261 sequences. (Running on oeis4.)