A146280 Number of n X n binary arrays with all ones connected only in a 111-110-111 pattern in any orientation.

1, 1, 5, 17, 37, 109, 2661, 46501, 480069, 5729689, 346242155, 24356919567, 1272792100111, 72738009625423, 11858558725473199, 2972962662671644607, 716003950107687603735

Offset

1,3

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.1.1.1.0.0.1.1.1
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.1.1
.0.0.0.0.0.0.0.0
.0.1.0.1.0.1.0.1
.0.1.1.1.0.1.1.1
.0.1.1.1.0.1.1.1

Crossrefs

Sequence in context: A347300 A212876 A147219 * A282511 A147181 A146850

Adjacent sequences: A146277 A146278 A146279 * A146281 A146282 A146283

Keyword

nonn,more

Author

R. H. Hardin

Status

approved