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A170932 a(n) = binomial(n + 8, 8)*7^n . 3
1, 63, 2205, 56595, 1188495, 21630609, 353299947, 5299499205, 74192988870, 980996186170, 12360551945742, 149450309889426, 1743586948709970, 19715944727720430, 216875392004924730, 2327795874186192102 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

With a different offset, number of n-permutations of 8 objects: r, s, t, u, v, z, x, y with repetition allowed, containing exactly eight, (8) u's.

LINKS

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

FORMULA

a(n) = C(n + 8, 8)*7^n.

MATHEMATICA

Table[Binomial[n + 8, 8]*7^n, {n, 0, 20}]

PROG

(MAGMA) [Binomial(n + 8, 8)*7^n: n in [0..20]]; // Vincenzo Librandi, Oct 12 2011

CROSSREFS

Cf. A027474, A140107, A139641, A140404, A036226, A050989.

Sequence in context: A110826 A017726 A240421 * A173191 A143401 A075516

Adjacent sequences:  A170929 A170930 A170931 * A170933 A170934 A170935

KEYWORD

nonn,easy

AUTHOR

Zerinvary Lajos, Feb 08 2010

STATUS

approved

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Last modified May 27 11:19 EDT 2022. Contains 354096 sequences. (Running on oeis4.)