A177647 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, down, down.

1, 1, 70, 34650, 63063000, 303526299000, 3187068420047305, 64239844119903312514

Offset

0,3

Links

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

Crossrefs

Cf. A014608.

Sequence in context: A177300 A266741 A177646 * A177658 A177670 A177671

Adjacent sequences: A177644 A177645 A177646 * A177648 A177649 A177650

Keyword

nonn

Author

R. H. Hardin, May 10 2010

Status

approved