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A189508 Column 2 of triangle in A189507. 1
1, 3, 21, 160, 1620, 19068, 264420, 4166880, 74011488, 1459381440, 31674232128 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..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: A205773 A192364 A286918 * A074570 A136781 A225439

Adjacent sequences:  A189505 A189506 A189507 * A189509 A189510 A189511

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

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Last modified July 17 18:47 EDT 2019. Contains 325109 sequences. (Running on oeis4.)