A177671 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, down, down, down, down.

1, 1, 70, 34650, 63063000, 304935162828, 3227357965784040, 65712161060921061615

Offset

0,3

Links

Table of n, a(n) for n=0..7.

Crossrefs

Cf. A014608.

Sequence in context: A177647 A177658 A177670 * A177656 A177657 A177676

Adjacent sequences: A177668 A177669 A177670 * A177672 A177673 A177674

Keyword

nonn

Author

R. H. Hardin, May 10 2010

Status

approved