A146909 Number of n X n binary arrays with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation.

1, 1, 1, 3, 9, 21, 85, 553, 5197, 59067, 895397, 19192871, 570897325, 23035046469, 1263961153269, 94815577724879, 9730236725590873, 1365210979058853347

Offset

1,4

Links

Table of n, a(n) for n=1..18.

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.0.0.1.0.1.1.1.0
.0.1.1.1.0.1.1.1
.0.0.1.1.1.0.1.0
.0.1.0.1.0.1.0.0
.1.1.1.0.1.1.1.0
.0.1.1.1.0.1.1.1
.0.0.1.0.0.0.1.0

Crossrefs

Sequence in context: A118932 A053499 A218003 * A146248 A074000 A067645

Adjacent sequences: A146906 A146907 A146908 * A146910 A146911 A146912

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved