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A034909 One third of octo-factorial numbers. 3
1, 11, 209, 5643, 197505, 8492715, 433128465, 25554579435, 1712156822145, 128411761660875, 10658176217852625, 969894035824588875, 96019509546634298625, 10274087521489869952875 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..14.

Index entries for sequences related to factorial numbers

FORMULA

3*a(n) = (8*n-5)(!^8) = product(8*j-5, j=1..n).

E.g.f.: (-1+(1-8*x)^(-3/8))/3.

G.f.: x/(1-11x/(1-8x/(1-19x/(1-16x/(1-27x/(1-24x/(1-35x/(1-32x/(1-... (continued fraction). - Philippe Deléham, Jan 07 2012

MATHEMATICA

s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 10, 5!, 8}]; lst (* Vladimir Joseph Stephan Orlovsky, Nov 08 2008 *)

CROSSREFS

Cf. A045755, A034908-A034912.

Sequence in context: A196849 A196699 A131216 * A081788 A060496 A280072

Adjacent sequences:  A034906 A034907 A034908 * A034910 A034911 A034912

KEYWORD

easy,nonn

AUTHOR

Wolfdieter Lang

STATUS

approved

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Last modified June 19 13:26 EDT 2019. Contains 324222 sequences. (Running on oeis4.)