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A146227
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111 pattern in any orientation.
0
1, 1, 1, 1, 3, 13, 37, 183, 817, 5601, 59649, 681701, 9890411, 176577709, 3939621645, 118135623109, 4491780681983, 213414295100783, 12753739646336971, 960252990758480757, 92263548659475375193
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.0.0.0
.0.0.0.1.1.0.0.0
.0.0.0.0.1.0.0.0
.1.1.0.0.1.0.1.1
.1.1.1.1.0.0.1.1
.0.0.0.0.0.0.0.1
.0.0.0.1.1.0.0.1
.0.0.0.1.1.1.1.0
CROSSREFS
Sequence in context: A024535 A196235 A120479 * A019007 A147554 A076800
KEYWORD
nonn
AUTHOR
STATUS
approved