A146183 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-100 pattern in any orientation.

1, 1, 1, 1, 5, 17, 43, 197, 1293, 11263, 110807, 1310257, 21564593, 459131585, 12523288493, 440243859565, 19398701026043, 1090842898014815, 79649624560507867, 7542069381975617255, 913933732625520247505

Offset

1,5

Links

Table of n, a(n) for n=1..21.

Example

Maximal 8 X 8 example
.0.0.1.1.1.0.0.0
.0.0.1.1.0.0.0.0
.1.1.0.1.0.0.0.0
.1.1.1.0.0.0.0.1
.1.0.0.0.0.1.1.1
.0.0.0.0.1.0.1.1
.0.0.0.0.1.1.0.0
.0.0.0.1.1.1.0.0

Crossrefs

Sequence in context: A089527 A146778 A146858 * A163424 A294102 A190969

Adjacent sequences: A146180 A146181 A146182 * A146184 A146185 A146186

Keyword

nonn

Author

R. H. Hardin, Oct 27 2008

Status

approved