A306738 Number of permutations of [n] allowing i->i+j (mod n), j=0..ceiling(n/2)-1.

1, 1, 1, 2, 2, 13, 20, 144, 264, 2783, 6208, 79118, 204448, 3182225, 9411840, 170576156, 566725760, 11804363619, 43573050368, 1023207993178, 4152609019392, 108681408827381, 481065936784384, 13880706183899752

Offset

0,4

Links

Table of n, a(n) for n=0..23.

Formula

a(n) = A008305(n,ceiling(n/2)).

Crossrefs

Cf. A008305.

Sequence in context: A340587 A347080 A141575 * A151352 A155915 A173466

Adjacent sequences: A306735 A306736 A306737 * A306739 A306740 A306741

Keyword

nonn

Author

Alois P. Heinz, Mar 06 2019

Status

approved