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A275063 Number of permutations p of [n] such that p(i)-i is a multiple of eight for all i in [n]. 2
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 128, 256, 768, 2304, 6912, 20736, 62208, 186624, 559872, 1679616, 6718464, 26873856, 107495424, 429981696, 1719926784, 6879707136, 27518828544, 110075314176, 550376570880, 2751882854400, 13759414272000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,10

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..665

FORMULA

a(n) = Product_{i=0..7} floor((n+i)/8)!.

EXAMPLE

a(9) = 2: 123456789, 923456781.

CROSSREFS

Column k=8 of A275062.

Sequence in context: A103662 A180211 A275075 * A186026 A023423 A210544

Adjacent sequences:  A275060 A275061 A275062 * A275064 A275065 A275066

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Jul 15 2016

STATUS

approved

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Last modified February 19 10:20 EST 2018. Contains 299330 sequences. (Running on oeis4.)