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A147219 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0101 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 17, 37, 107, 651, 4763, 31885, 243507, 2726593, 39573223, 647861719, 12294997893, 299566536047, 9265546813073, 344823799726629 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.1.0.1.0

.0.0.0.0.1.1.1.0

.0.0.1.1.0.0.1.1

.0.0.0.1.0.0.0.0

.0.0.1.1.1.0.0.0

.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A121326 A347300 A212876 * A146280 A282511 A147181

Adjacent sequences: A147216 A147217 A147218 * A147220 A147221 A147222

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified February 3 14:58 EST 2023. Contains 360035 sequences. (Running on oeis4.)