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A146691 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 19, 31, 599, 1163, 13781, 34743, 686711, 2032193, 168115995, 630196685, 103169062863, 486468362253, 96427000262963, 558209750316079, 186248241738031493 (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

.0.1.1.0.0.1.1.0

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.1.0.0.0.0.0.0.1

.0.0.1.0.0.1.0.0

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A125602 A139847 A087764 * A146784 A147240 A147210

Adjacent sequences:  A146688 A146689 A146690 * A146692 A146693 A146694

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified September 29 22:48 EDT 2022. Contains 357092 sequences. (Running on oeis4.)