A221842 - OEIS

%I #18 Feb 07 2014 04:08:00

%S 1,0,0,1,0,4,8,36,105,384,1340,4975,17676,69052,270716,1093218,

%T 4455047,18246018

%N Number of ways to dissect a square into n squares.

%H Ed Wynn, <a href="http://arxiv.org/abs/1308.5420">Exhaustive generation of Mrs Perkins's quilt square dissections for low orders</a>, arXiv:1308.5420

%e For n = 6 there are a(6) = 4 ways:

%e +-+-+-+   +-+-+-+   +-+---+   +---+-+

%e | | | |   | | | |   | |   |   |   | |

%e +-+-+-+   +-+-+-+   +-+   |   |   +-+

%e | |   |   |   | |   | |   |   |   | |

%e +-+   |   |   +-+   +-+-+-+   +-+-+-+

%e | |   |   |   | |   | | | |   | | | |

%e +-+---+   +---+-+   +-+-+-+   +-+-+-+

%Y Cf. A221841.

%K nonn,more

%O 1,6

%A _Geoffrey H. Morley_, Jan 26 2013

%E a(10) corrected (thanks to _Ed Wynn_) by _Geoffrey H. Morley_, Aug 02 2013

%E More terms from Wynn, 2013. - _N. J. A. Sloane_, Nov 29 2013