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A146270 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-110 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 8, 19, 32, 51, 140, 477, 1662, 6189, 24619, 109450, 533450, 2859993, 16886952, 110380054, 797354362, 6460189913, 58366269898, 572562441744, 6143132227217, 72768344185209 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.0.0

.0.1.0.0.1.1.1.0

.1.1.1.0.1.1.0.0

.1.1.1.0.0.0.0.0

.0.0.0.0.0.1.1.1

.0.0.1.1.0.1.1.1

.0.1.1.1.0.0.1.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A260004 A144171 A017485 * A146222 A140672 A230098

Adjacent sequences:  A146267 A146268 A146269 * A146271 A146272 A146273

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified May 21 07:22 EDT 2022. Contains 353889 sequences. (Running on oeis4.)