OFFSET
1,7
LINKS
Ed Wynn, Exhaustive generation of Mrs Perkins's quilt square dissections for low orders, 2013, arXiv:1308.5420
EXAMPLE
For n = 7 there are a(7) = 2 ways:
+---+---+ +---+---+
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+-+-+-+-+ +---+-+-+
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+-+ +-+ | +-+-+
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+-+---+-+ +---+-+-+
CROSSREFS
KEYWORD
nonn,nice,more
AUTHOR
Geoffrey H. Morley, Jan 26 2013
EXTENSIONS
a(10) corrected (thanks to Ed Wynn) by Geoffrey H. Morley, Aug 02 2013
More terms from Wynn, 2013. - N. J. A. Sloane, Nov 29 2013
STATUS
approved