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A147142 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation. 0
1, 1, 1, 3, 7, 17, 39, 127, 681, 3913, 21369, 147701, 1344439, 15252227, 199338371, 3018576265, 55990200331, 1283966558111, 35424143775231 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.0.0

.0.0.0.0.0.1.1.0

.0.0.0.0.0.0.1.1

.0.0.0.0.1.1.0.1

.1.0.0.1.0.1.1.0

.1.1.0.1.1.0.1.1

.0.1.1.0.1.1.0.1

.0.0.1.1.0.1.1.0

CROSSREFS

Sequence in context: A191825 A077927 A005197 * A106472 A036885 A137682

Adjacent sequences:  A147139 A147140 A147141 * A147143 A147144 A147145

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net), Nov 04 2008

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Last modified February 15 16:21 EST 2012. Contains 205823 sequences.