A177639 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up.

1, 46, 11722, 9659528, 19879855515, 86520373465693, 709390751745167960, 10064485309871565223880

Offset

1,2

Links

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

Crossrefs

Sequence in context: A302114 A159380 A134793 * A222097 A152501 A209474

Adjacent sequences: A177636 A177637 A177638 * A177640 A177641 A177642

Keyword

nonn

Author

R. H. Hardin, May 10 2010

Extensions

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

Status

approved