OFFSET
1,5
LINKS
Christopher Hunt Gribble, C++ program for A226978, A226979, A226980, A226981, A227004
Ed Wynn, Exhaustive generation of Mrs Perkins's quilt square dissections for low orders, arXiv:1308.5420
FORMULA
EXAMPLE
For n=5, there are 45 dissections where the orbits under the symmetry group of the square, D4, have 8 elements.
For n=4, this is the only dissection:
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CROSSREFS
KEYWORD
nonn,more
AUTHOR
Christopher Hunt Gribble, Jun 25 2013
EXTENSIONS
a(8)-a(12) from Ed Wynn, Apr 02 2014
STATUS
approved