A180395 Number of permutations of 1..n with both permutation and its inverse having exactly 5 maxima

0, 0, 0, 0, 0, 0, 0, 0, 213, 38970, 2199243, 66436204, 1334964325, 20003126222, 239548888455

Offset

1,9

Links

Table of n, a(n) for n=1..15.

Crossrefs

Sequence in context: A201342 A092796 A280898 * A242793 A335721 A242804

Adjacent sequences: A180392 A180393 A180394 * A180396 A180397 A180398

Keyword

nonn

Author

R. H. Hardin Sep 01 2010

Status

approved