A177300 Number of permutations of 4 copies of 1..n with all adjacent differences <= 3 in absolute value.

1, 1, 70, 34650, 63063000, 42251309100, 17268436078740, 6595449547140990, 2941134289344290882

Offset

0,3

Comments

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

Links

Table of n, a(n) for n=0..8.

Crossrefs

Cf. A014608.

Sequence in context: A177664 A177674 A177675 * A266741 A177646 A177647

Adjacent sequences: A177297 A177298 A177299 * A177301 A177302 A177303

Keyword

nonn

Author

R. H. Hardin, May 06 2010

Status

approved