A189508 Column 2 of triangle in A189507.

1, 3, 21, 160, 1620, 19068, 264420, 4166880, 74011488, 1459381440, 31674232128

Offset: 1

Author

N. J. A. Sloane, Apr 23 2011

Keywords

• nonn
• more

Links

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

Crossrefs

Cf. A189507.

Extensions

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