A189509 Column 3 of triangle in A189507.

1, 6, 65, 701, 9324, 138016, 2325740, 43448940, 897020784, 20241273264

Offset

2,2

Links

Table of n, a(n) for n=2..11.

Simona Grusea and Anthony Labarre, The distribution of cycles in breakpoint graphs of signed permutations, arXiv:1104.3353v1

Crossrefs

Cf. A189507.

Sequence in context: A350946 A297516 A099343 * A360977 A376087 A243698

Adjacent sequences: A189506 A189507 A189508 * A189510 A189511 A189512

Keyword

nonn,more

Author

N. J. A. Sloane, Apr 23 2011

Extensions

Added missing term for n=9, Anthony Labarre, Feb 14 2013

Status

approved