A177666 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, up, down

1, 68, 31212, 50966304, 217643900486, 2016891757663928, 35773214436504563352

Offset

1,2

Links

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

Crossrefs

Sequence in context: A307137 A230685 A093234 * A292607 A211311 A367529

Adjacent sequences: A177663 A177664 A177665 * A177667 A177668 A177669

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved