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A146251 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-011 pattern in any orientation. 0
1, 1, 3, 5, 9, 19, 71, 265, 1031, 4533, 26975, 188011, 1487007, 13567107, 149156483, 1938922129, 29541083501, 528608677059, 11174794559755, 278126836279869, 8142808516685673, 280747197308433325, 11410125160644854247 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.0.0.1.1.0

.1.1.1.0.0.1.1.1

.1.1.0.1.1.0.1.1

.0.0.1.1.1.0.0.0

.0.0.1.1.0.0.0.0

.1.1.0.0.0.1.1.0

.1.1.1.0.0.1.1.1

.0.1.1.0.0.0.1.1

CROSSREFS

Sequence in context: A147010 A146912 A146940 * A281732 A066777 A260353

Adjacent sequences:  A146248 A146249 A146250 * A146252 A146253 A146254

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 26 12:00 EDT 2022. Contains 356997 sequences. (Running on oeis4.)