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A180396 Number of permutations of 1..n with both permutation and its inverse having exactly 6 maxima 0
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3717, 1167268, 108778518, 5265259064, 165412392895 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

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

CROSSREFS

Sequence in context: A179623 A263035 A252161 * A158917 A252421 A296908

Adjacent sequences: A180393 A180394 A180395 * A180397 A180398 A180399

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 01 2010

STATUS

approved

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Last modified February 8 15:28 EST 2023. Contains 360149 sequences. (Running on oeis4.)