OFFSET
1,3
COMMENTS
A dissection into squares was called prime by J. H. Conway in 1964 if the GCD of the sides of the squares is 1.
REFERENCES
J. H. Conway, Mrs Perkins's quilt, Proc. Camb. Phil. Soc., 60 (1964), 363-368.
LINKS
Ed Wynn, Exhaustive generation of Mrs Perkins's quilt square dissections for low orders, arXiv:1308.5420
EXAMPLE
For n = 3 the a(3) = 5 dissections are:
+-+-+-+ +-+-+-+ +-+-+-+ +-+---+ +---+-+
| | | | | | | | | | | | | | | | | |
+-+-+-+ +-+-+-+ +-+-+-+ +-+ | | +-+
| | | | | | | | | | | | | | | |
+-+-+-+ +-+ | | +-+ +-+-+-+ +-+-+-+
| | | | | | | | | | | | | | | | | |
+-+-+-+ +-+---+ +---+-+ +-+-+-+ +-+-+-+
CROSSREFS
KEYWORD
nonn
AUTHOR
Geoffrey H. Morley, Jan 26 2013
EXTENSIONS
Corrected and extended to a(15) by Geoffrey H. Morley, Feb 05 2013
STATUS
approved