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A147038
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation.
0
1, 1, 1, 3, 5, 9, 21, 69, 305, 1333, 6087, 37147, 280959, 2501123, 26363255, 322801403, 4679667007, 81403804671, 1686900283495, 41922642406637, 1239283752468159, 43217375654523227, 1785265760870915049, 87797244145177135687
OFFSET
1,4
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.0.0.1.0
.0.0.1.0.1.1.1.1
.1.1.1.1.0.0.1.0
.0.0.1.0.0.0.1.0
.0.1.0.0.0.1.0.0
.0.1.0.0.1.1.1.1
.1.1.1.1.0.1.0.0
.0.1.0.0.0.1.0.0
CROSSREFS
Sequence in context: A129787 A328525 A125517 * A146275 A089636 A241398
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved