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A146465
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 77, 255, 1039, 4359, 18069, 81085, 437915, 2749579, 20046895, 155332489, 1345844489, 12832415197, 142867250585
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.1.1.1.0.0.0
.0.1.0.0.1.0.0.1
.0.1.0.0.0.1.1.1
.1.1.1.0.0.0.1.0
.1.0.0.1.0.0.1.0
.0.0.0.1.1.1.0.0
.0.0.1.1.0.0.0.0
CROSSREFS
Sequence in context: A146409 A147111 A146401 * A147119 A146184 A155274
KEYWORD
nonn
AUTHOR
STATUS
approved