A177641 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, down.

1, 70, 34650, 59789280, 266337847482, 2554877633330088, 46673357620120575102, 1485635287258589886509256

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177299 A266740 A177640 * A177648 A177653 A177659

Adjacent sequences: A177638 A177639 A177640 * A177642 A177643 A177644

Keyword

nonn

Author

R. H. Hardin, May 10 2010

Extensions

a(8) from Alois P. Heinz, Nov 02 2013

Status

approved