A147460 Number of n X n binary arrays with all ones connected only in a 1100-1111-0011 pattern in any orientation.

1, 1, 1, 9, 25, 93, 589, 6735, 107293, 1848191, 45715541, 1702371353, 91650035599, 6670440839931, 660214237801903

Offset

1,4

Links

Table of n, a(n) for n=1..15.

Example

Maximal 8 X 8 example
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.0.0.1.1.0.0.0.0
.0.0.1.1.0.0.1.1
.0.1.1.0.1.1.1.1
.0.1.1.0.1.1.0.0

Crossrefs

Sequence in context: A075067 A075064 A147332 * A147475 A146674 A083672

Adjacent sequences: A147457 A147458 A147459 * A147461 A147462 A147463

Keyword

nonn

Author

R. H. Hardin

Status

approved