A177672 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, down, down, up, up

1, 70, 34470, 61633118, 290404848165, 2980163520882356, 58650349023599896052

Offset

1,2

Links

Table of n, a(n) for n=1..7.

Crossrefs

Sequence in context: A177668 A177673 A177661 * A177299 A266740 A177640

Adjacent sequences: A177669 A177670 A177671 * A177673 A177674 A177675

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved