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A173191 a(n) = binomial(n + 6, 6)*9^n. 4
1, 63, 2268, 61236, 1377810, 27280638, 491051484, 8207574804, 129269303163, 1939039547445, 27922169483208, 388371993720984, 5243021915233284, 68965903654222428, 886704475554288360, 11172476391984033336 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Number of n-permutations (n>=6) of 10 objects p, r, q, u, v, w, z, x, y, z with repetition allowed, containing exactly six (6) u's.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..400

FORMULA

a(n) = C(n + 6, 6)*9^n.

MAPLE

A173191:=n->binomial(n+6, 6)*9^n: seq(A173191(n), n=0..25); # Wesley Ivan Hurt, Jul 24 2017

MATHEMATICA

Table[Binomial[n + 6, 6]*9^n, {n, 0, 20}]

PROG

(MAGMA) [Binomial(n+6, 6)*9^n: n in [0..20]]; // Vincenzo Librandi, Oct 13 2011

CROSSREFS

Cf. A081139, A173000, A173187, A173188.

Sequence in context: A017726 A240421 A170932 * A143401 A075516 A004376

Adjacent sequences:  A173188 A173189 A173190 * A173192 A173193 A173194

KEYWORD

nonn,easy

AUTHOR

Zerinvary Lajos, Feb 12 2010

STATUS

approved

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Last modified May 28 18:24 EDT 2022. Contains 354122 sequences. (Running on oeis4.)