A146272 Number of n X n binary arrays with all ones connected only in a 110-111-111 pattern in any orientation.

1, 1, 5, 17, 39, 173, 3199, 51175, 661225, 13583567, 722876085, 45766294357, 3140059939559, 313372103740953, 57398488477811657, 14396095473760523773

Offset

1,3

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.1.1
.1.1.1.0.0.1.1.1
.1.1.1.0.0.0.1.1
.1.1.0.1.1.1.0.0
.0.0.0.1.1.1.0.0
.1.1.0.1.1.0.1.1
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1

Crossrefs

Sequence in context: A146645 A146717 A147467 * A147035 A146134 A011931

Adjacent sequences: A146269 A146270 A146271 * A146273 A146274 A146275

Keyword

nonn

Author

R. H. Hardin

Status

approved