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A035265 One half of deca-factorial numbers. 4
1, 12, 264, 8448, 354816, 18450432, 1143926784, 82362728448, 6753743732736, 621344423411712, 63377131187994624, 7098238693055397888, 865985120552758542336, 114310035912964127588352 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n)= (Pochhammer(2/10,n)*10^n)/2.

LINKS

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

Index entries for sequences related to factorial numbers

FORMULA

2*a(n) = (10*n-8)(!^10) := product(10*j-8, j=1..n)= 2^n*A008548(n), A008548(n)=(5*n-4)(!^5) := product(5*j-4, j=1..n); E.g.f. (-1+(1-10*x)^(-1/5))/2.

CROSSREFS

Cf. A008548, A045757, A035272-A035279.

Sequence in context: A295844 A113672 A259269 * A167869 A068271 A068283

Adjacent sequences:  A035262 A035263 A035264 * A035266 A035267 A035268

KEYWORD

easy,nonn

AUTHOR

Wolfdieter Lang

STATUS

approved

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Last modified September 22 15:16 EDT 2018. Contains 315270 sequences. (Running on oeis4.)