A147242 - OEIS

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A147242

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111-0010 pattern in any orientation.

1, 1, 1, 1, 3, 9, 27, 87, 355, 2031, 15277, 134979, 1439889, 18930955, 307011633, 6239442943, 159275538371, 5042353704513, 196402826178807, 9418588421118425

(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

.0.0.0.1.1.0.0.0

.0.0.1.1.0.0.0.0

.0.1.0.1.1.0.0.1

.1.1.1.0.1.0.1.1

.1.0.1.1.0.1.1.0

.0.0.0.0.1.0.1.1

.0.0.0.1.1.1.0.0

.0.0.1.1.0.1.0.0

CROSSREFS

Sequence in context: A146786 A151029 A179263 * A148924 A113994 A302860

Adjacent sequences: A147239 A147240 A147241 * A147243 A147244 A147245

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved