A226299 Number of primitive permutations with n buds and 6 red or blue elements.
1, 25, 540, 11760, 268365, 6495345
Offset: 0
Links
- Adrian Ocneanu, On the inner structure of a permutation: bicolored partitions and Eulerians, trees and primitives, arXiv preprint arXiv:1304.1263 [math.CO], 2013.