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A147212 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0011 pattern in any orientation. 0
1, 1, 1, 1, 3, 9, 23, 55, 315, 2117, 14227, 107639, 1242577, 18337443, 306941589, 6236872411, 166949397689, 5617277183949, 229023263912585, 11581498844555427 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.0.0

.0.0.0.0.0.1.1.1

.0.0.0.0.0.0.1.1

.0.0.0.0.1.1.0.0

.1.0.0.1.0.1.1.1

.1.1.0.1.1.0.1.1

.0.1.1.0.1.1.0.0

.0.1.1.0.1.1.0.0

CROSSREFS

Sequence in context: A305168 A274099 A147126 * A341029 A045883 A292329

Adjacent sequences:  A147209 A147210 A147211 * A147213 A147214 A147215

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.)