A177595 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down.

1, 10, 238, 10588, 779092, 87126856, 13960372312, 3064747884400, 890409817619536, 332982388081862176

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Crossrefs

Sequence in context: A268080 A096331 A159497 * A013922 A215835 A006423

Adjacent sequences: A177592 A177593 A177594 * A177596 A177597 A177598

Keyword

nonn

Author

R. H. Hardin, May 10 2010

Extensions

a(10) from Alois P. Heinz, Oct 22 2013

Status

approved