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A112362
A006967(n)/2.
0
1, 2, 2, 4, 12, 16, 20, 60, 148, 324, 664, 1600, 4956, 12796, 27960, 71596, 255348, 725648, 1748672
OFFSET
2,2
CROSSREFS
Sequence in context: A134435 A136718 A362709 * A134720 A019225 A002840
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 02 2005
STATUS
approved