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A226299 Number of primitive permutations with n buds and 6 red or blue elements. 1
1, 25, 540, 11760, 268365, 6495345 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..5.

Adrian Ocneanu, On the inner structure of a permutation: bicolored partitions and Eulerians, trees and primitives, arXiv preprint arXiv:1304.1263, 2013

CROSSREFS

Sequence in context: A144942 A122140 A083191 * A264378 A015679 A230454

Adjacent sequences:  A226296 A226297 A226298 * A226300 A226301 A226302

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Jun 05 2013

STATUS

approved

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Last modified June 2 08:23 EDT 2020. Contains 334767 sequences. (Running on oeis4.)