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A146222 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 101-111-010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 8, 19, 32, 59, 168, 529, 2001, 7331, 32274, 148084, 749186, 4153139, 26410348, 177997054, 1409667475, 11785334777, 115210607000, 1184859282420, 13940662127003 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.0.1.0

.1.1.0.0.1.1.1.0

.0.1.1.0.0.1.0.0

.1.1.0.0.0.0.0.0

.0.0.0.0.0.0.1.1

.0.0.1.0.0.1.1.0

.0.1.1.1.0.0.1.1

.0.1.0.1.0.0.0.0

CROSSREFS

Sequence in context: A144171 A017485 A146270 * A140672 A230098 A262713

Adjacent sequences:  A146219 A146220 A146221 * A146223 A146224 A146225

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified January 18 00:43 EST 2022. Contains 350410 sequences. (Running on oeis4.)