A177668 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, up, down, down

1, 70, 34170, 59884570, 274748917668, 2733943136188260, 52021960549094250369

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177650 A177655 A177663 * A177673 A177661 A177672

Adjacent sequences: A177665 A177666 A177667 * A177669 A177670 A177671

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved