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A177309 Number of permutations of 7 copies of 1..n with all adjacent differences <= 3 in absolute value. 0
1, 1, 3432, 399072960, 472518347558400, 102038786510159790720, 9792481437399343532438160 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

a(n) = (7n)!/5040^n for n<=4.

LINKS

Table of n, a(n) for n=0..6.

CROSSREFS

Cf. A172603.

Sequence in context: A177307 A140911 A177308 * A172603 A172559 A172658

Adjacent sequences:  A177306 A177307 A177308 * A177310 A177311 A177312

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 06 2010

STATUS

approved

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Last modified October 21 14:18 EDT 2021. Contains 348155 sequences. (Running on oeis4.)