A177649 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, up, down

1, 70, 31830, 50395146, 205822250572, 1808558575291438, 30242498188745996934

Offset

1,2

Links

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

Crossrefs

Sequence in context: A177642 A177644 A146499 * A177651 A177645 A177662

Adjacent sequences: A177646 A177647 A177648 * A177650 A177651 A177652

Keyword

nonn

Author

R. H. Hardin May 10 2010

Status

approved