login
A146904
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 7, 13, 27, 81, 287, 1153, 4961, 23911, 134777, 885445, 6659249, 57412261, 568445509, 6410206283, 82425528579, 1216468689493, 20669872378163, 403437418129203, 9012600422728359, 230172718811608655, 6730737235950056465
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.1.0
.0.0.0.0.1.1.1.0
.0.0.0.0.0.1.1.1
.0.0.1.0.0.1.0.0
.0.0.1.1.1.0.0.0
.0.1.1.1.0.0.0.0
.0.0.0.1.0.0.0.0
CROSSREFS
Sequence in context: A080241 A098479 A119445 * A146432 A258349 A089726
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved