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A248708 f(4n+2)/(f(n-1)*f(n)*f(n+1)*f(n+2)), where f(k) = k!. 4
60, 12600, 2522520, 514594080, 107550162720, 22969641895200, 4995897112206000, 1103284402265073600, 246784661070292144800, 55803246694136969227200, 12736017918577260592084800, 2930174751896446667689440000, 678879630375093886522676256000 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
These are multinomial coefficients.
LINKS
FORMULA
a(n) ~ 2^(8*n+7/2) / (Pi^(3/2) * n^(3/2)). - Vaclav Kotesovec, Oct 19 2014
EXAMPLE
a(2) = 10!/(1!*2!*3!*4!) = 12600.
MATHEMATICA
Table[(4 n + 2)!/((n - 1)! n! (n + 1)! (n + 2)!), {n, 1, 20}]
CROSSREFS
Sequence in context: A269883 A251991 A145411 * A184890 A295598 A113424
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Oct 12 2014
STATUS
approved

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Last modified May 29 00:29 EDT 2024. Contains 372921 sequences. (Running on oeis4.)