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A189508
Column 2 of triangle in A189507.
1
1, 3, 21, 160, 1620, 19068, 264420, 4166880, 74011488, 1459381440, 31674232128
OFFSET
1,2
CROSSREFS
Cf. A189507.
Sequence in context: A286918 A372463 A358953 * A074570 A136781 A225439
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