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A180237 Number of lexicographically ordered pairs of permutations of 0..2n-2 such that their sum mod 2n-1 is also a permutation of 0..2n-2 0
1, 12, 960, 337680, 367597440, 755465356800, 3208061483827200, 23775433137840384000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Numbers for permutations of 0..2n-1 are zero.

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Sequence in context: A114371 A047802 A278705 * A079916 A204327 A123283

Adjacent sequences:  A180234 A180235 A180236 * A180238 A180239 A180240

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 18 2010

STATUS

approved

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Last modified March 29 14:54 EDT 2020. Contains 333107 sequences. (Running on oeis4.)