A146901 Number of n X n binary arrays with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.

1, 1, 1, 3, 9, 19, 49, 345, 3029, 26343, 253497, 4034589, 91237121, 2505865849, 83922611151, 3827327413577, 239094333954443, 19417775019886243

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.0.1.0.0.0.1.0.0
.0.1.1.1.0.1.1.1
.1.1.1.0.1.1.1.0
.0.0.1.0.0.0.1.0
.0.1.0.0.0.1.0.0
.0.1.1.1.0.1.1.1
.1.1.1.0.1.1.1.0
.0.0.1.0.0.0.1.0

Crossrefs

Sequence in context: A091411 A279682 A102001 * A147477 A146677 A077442

Adjacent sequences: A146898 A146899 A146900 * A146902 A146903 A146904

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved