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A177299 Number of permutations of 4 copies of 1..n with all adjacent differences <= 2 in absolute value. 0
1, 70, 34650, 4635540, 439192790, 51023044582, 5712786772130, 590059992663400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n)=(4n)!/24^n for n<=3

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Sequence in context: A177673 A177661 A177672 * A266740 A177640 A177641

Adjacent sequences:  A177296 A177297 A177298 * A177300 A177301 A177302

KEYWORD

nonn

AUTHOR

R. H. Hardin May 06 2010

STATUS

approved

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Last modified April 23 13:25 EDT 2019. Contains 322386 sequences. (Running on oeis4.)