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A146233 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-111-001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 133, 283, 2347, 6395, 87753, 251797, 22858141, 88041969, 27840502421, 144128912619, 33034155808473, 218240863171141, 101999530698529103, 841310414172182303, 1459539385749799398341 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.1.0.0.0.0.0.0.1

.1.1.1.0.0.1.1.1

.0.1.1.0.0.1.1.0

.1.0.0.0.0.0.0.1

.1.1.1.0.0.1.1.1

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A250766 A254692 A050882 * A146181 A105984 A115518

Adjacent sequences:  A146230 A146231 A146232 * A146234 A146235 A146236

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified May 16 06:43 EDT 2022. Contains 353693 sequences. (Running on oeis4.)