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A146436 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 101-111-101 pattern in any orientation. 0
1, 1, 3, 1, 3, 9, 23, 73, 239, 601, 4153, 14191, 114759, 580339, 5550888, 46368603, 562683992, 5393792447, 97221007962, 1178726702163, 29671069397702, 489244079163479 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
EXAMPLE
Maximal 8 X 8 example
.1.1.1.0.0.0.0.0
.0.1.0.0.1.0.1.0
.1.1.1.0.1.1.1.0
.0.0.0.0.1.0.1.0
.0.1.0.1.0.0.0.0
.0.1.1.1.0.1.1.1
.0.1.0.1.0.0.1.0
.0.0.0.0.0.1.1.1
CROSSREFS
Sequence in context: A088442 A037095 A160654 * A058842 A155734 A128162
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified April 21 22:18 EDT 2024. Contains 371886 sequences. (Running on oeis4.)