A146144 Number of n X n binary arrays with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.

1, 1, 5, 19, 97, 863, 18767, 490889, 19713443, 1413873475, 167866752937, 30662833126025, 9066289386941209

Offset

1,3

Links

Table of n, a(n) for n=1..13.

Example

Maximal 8 X 8 example
.0.1.1.0.0.0.1.1
.1.0.1.1.0.1.1.0
.1.1.0.1.0.1.0.1
.0.1.1.0.0.0.1.1
.0.0.0.0.0.1.1.0
.0.1.1.0.1.0.0.1
.1.1.0.1.1.0.1.1
.1.0.1.1.0.1.1.0

Crossrefs

Sequence in context: A331336 A361278 A375654 * A162292 A321875 A359808

Adjacent sequences: A146141 A146142 A146143 * A146145 A146146 A146147

Keyword

nonn

Author

R. H. Hardin, Oct 27 2008

Status

approved