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A146372 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 13, 27, 135, 531, 2573, 17743, 176473, 1599401, 23234641, 323134671, 6982586189, 150620917453, 4817580729223, 154870862911911 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.0.0.0.0.1.1.1.1
.0.1.0.0.0.0.1.0
.1.1.1.1.0.1.0.0
.0.0.1.0.1.1.1.1
.0.1.0.0.0.0.1.0
.1.1.1.1.0.0.0.0
.0.0.1.0.0.0.0.0
CROSSREFS
Sequence in context: A041332 A041334 A146380 * A018946 A042397 A041336
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified February 20 18:38 EST 2024. Contains 370217 sequences. (Running on oeis4.)