A146429 Number of n X n binary arrays with all ones connected only in a 101-111-101 pattern in any orientation.

1, 1, 3, 9, 19, 53, 531, 5709, 48307, 490649, 11283333, 359196547, 11541091447, 440660012263, 27722494439108, 2548067434592087, 280390489794224900

Offset

1,3

Links

Table of n, a(n) for n=1..17.

Example

Maximal 8 X 8 example
.1.1.1.0.0.1.0.1
.0.1.0.0.0.1.1.1
.1.1.1.0.0.1.0.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.0.1.0.1.0.1
.0.1.1.1.0.1.1.1
.0.1.0.1.0.1.0.1

Crossrefs

Sequence in context: A146677 A077442 A147455 * A297390 A018316 A146605

Adjacent sequences: A146426 A146427 A146428 * A146430 A146431 A146432

Keyword

nonn

Author

R. H. Hardin

Status

approved