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A255440 Ordered pairs of permutation functions on n elements satisfying f(g(g(g(x)))) = g(g(g(f(x)))). 1
1, 1, 4, 24, 288, 3240, 74160, 1970640, 55762560, 2271628800, 118676275200, 5949399456000, 389282684313600, 31351069535385600, 2431871996666112000, 227068393053325824000, 25547764411931553792000, 2795442523571128983552000, 350437557048098924371968000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

See A239841 for more information and a proof that a(n) is a multiple of n!.

a(n) appears be n! * A232218(n).

LINKS

Hiroaki Yamanouchi, Table of n, a(n) for n = 0..60

CROSSREFS

Cf. A239841, A232218

Sequence in context: A080489 A101228 A009104 * A052727 A219118 A005756

Adjacent sequences:  A255437 A255438 A255439 * A255441 A255442 A255443

KEYWORD

nonn

AUTHOR

Paul Boddington, Feb 24 2015

EXTENSIONS

a(18) from Hiroaki Yamanouchi, Mar 13 2015

STATUS

approved

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Last modified September 25 09:35 EDT 2022. Contains 356977 sequences. (Running on oeis4.)