A243511 Number of ways half the maximal number of domicules can be placed on an n X n square.

1, 1, 6, 110, 18343, 9382388, 43019044258, 558605693874364, 66236678406528448449, 21324218858696872235790649, 63694548993039561351614359349824, 503614181552476916158019971522161589536, 37393123107750749849065997795023579513072683993, 7226766277015485498828489748946241590630740791829515424

Offset: 0

Author

Alois P. Heinz, Jun 05 2014

Keywords

• nonn

Examples

			a(2) = 6:
+---+  +---+  +---+  +---+  +---+  +---+
|o-o|  |   |  |o  |  |  o|  |o  |  |  o|
|   |  |   |  ||  |  |  ||  | \ |  | / |
|   |  |o-o|  |o  |  |  o|  |  o|  |o  |
+---+  +---+  +---+  +---+  +---+  +---+.
		

Crossrefs

Cf. A243510.

Formula

a(n) = A243424(n,floor(n^2/4)).