A180391 Number of permutations of 1..n with the permutation and its inverse having the same number of maxima

1, 2, 4, 16, 74, 372, 2484, 18752, 155654, 1489692, 15673104, 179244512, 2245555252, 30338525896

Offset

1,2

Links

Table of n, a(n) for n=1..14.

Crossrefs

Sequence in context: A213327 A192623 A155519 * A371389 A275555 A370485

Adjacent sequences: A180388 A180389 A180390 * A180392 A180393 A180394

Keyword

nonn

Author

R. H. Hardin Sep 01 2010

Status

approved