A221841 Number of ways to dissect a square into n squares up to symmetry.

1, 0, 0, 1, 0, 1, 2, 6, 16, 56, 183, 657, 2277, 8813, 34178, 137578, 558734, 2285694

Offset: 1

Author

Geoffrey H. Morley, Jan 26 2013

Keywords

• nonn
• nice
• more

Examples

			For n = 7 there are a(7) = 2 ways:
+---+---+   +---+---+
|   |   |   |   |   |
|   |   |   |   |   |
|   |   |   |   |   |
+-+-+-+-+   +---+-+-+
| |   | |   |   | | |
+-+   +-+   |   +-+-+
| |   | |   |   | | |
+-+---+-+   +---+-+-+
		

Links

• Ed Wynn, Exhaustive generation of Mrs Perkins's quilt square dissections for low orders, 2013, arXiv:1308.5420

Crossrefs

Cf. A221840, A221842.

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