A145773 Number of n X n binary arrays with all ones connected only either two adjacent vertically or two adjacent horizontally.

1, 5, 25, 314, 7358, 349511, 32855368, 6141909014, 2284689480141, 1689669248970784, 2485350221377308028, 7269523179423750332937, 42286820404292801713317670, 489171492515135237008883532896

Offset: 1

Author

R. H. Hardin, Oct 18 2008

Keywords

• nonn
• more

Examples

			Maximal 5 X 5 example
.1.1.0.0.1
.0.0.0.0.1
.1.0.1.1.0
.1.0.0.0.1
.0.1.1.0.1