A177611 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up, down, up

1, 19, 1446, 274821, 105551154, 71820303857, 79064800732654, 131813777765106241

Offset

1,2

Links

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

Crossrefs

Sequence in context: A047910 A357230 A237429 * A051847 A217830 A002115

Adjacent sequences: A177608 A177609 A177610 * A177612 A177613 A177614

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved