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A147210 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0111-0011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 19, 31, 671, 1393, 17427, 44279, 1106663, 3412457, 320938143, 1265591403, 240272372207, 1198689233053, 298357443446865, 1842799915443649, 817026217664351385, 6225260273965873969 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.0.0.1.1.0

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.0.0.1.0.0.1.0.0

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A146691 A146784 A147240 * A146816 A146659 A160220

Adjacent sequences:  A147207 A147208 A147209 * A147211 A147212 A147213

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified August 11 15:10 EDT 2022. Contains 356066 sequences. (Running on oeis4.)