A146435 - OEIS

A146435

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 101-111-101 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 7, 15, 21, 45, 85, 217, 491, 1576, 4887, 18646, 57135, 229742, 795595, 3741694, 15529847, 86241543, 433623155, 2850108871, 16134076143, 119392023601, 762153190955, 6488172864617

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,7

LINKS

Table of n, a(n) for n=1..29.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.1.0.1.0.0.1.0.0

.1.1.1.0.1.1.1.0

.1.0.1.0.0.0.0.0

.0.0.0.0.0.1.0.1

.0.1.1.1.0.1.1.1

.0.0.1.0.0.1.0.1

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A139208 A324727 A320026 * A046932 A015821 A229527

Adjacent sequences: A146432 A146433 A146434 * A146436 A146437 A146438

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved