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A107762 Number of permutations of (1,3,5,7,9,...,2n-1) in which every pair of adjacent numbers as well as the first and the last entries are relatively prime. 2
1, 2, 6, 24, 60, 432, 3360, 6912, 86400, 1080000, 3432000, 57542400, 601810560, 3374784000, 71391196800, 1506917744640, 8134703216640, 87731370397440, 2330058011258880, 15991083879321600, 484342868413071360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Odd analog of A102381. Equals n*A107763(n).

LINKS

Table of n, a(n) for n=1..21.

CROSSREFS

Cf. A076220, A086595, A102381, A107761, A107763.

Sequence in context: A189855 A189566 A178009 * A253901 A027562 A236625

Adjacent sequences:  A107759 A107760 A107761 * A107763 A107764 A107765

KEYWORD

nonn

AUTHOR

Ray Chandler, Jun 11 2005

EXTENSIONS

More terms from Max Alekseyev, Jun 11 2005

STATUS

approved

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Last modified March 5 11:06 EST 2021. Contains 341823 sequences. (Running on oeis4.)