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A146814 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1010-1111 pattern in any orientation. 0
1, 1, 1, 1, 5, 17, 51, 255, 1303, 6487, 45597, 373491, 4375333, 54687233, 1001558187, 19226580191 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example:

.1.1.1.1.0.0.0.1

.1.0.1.0.0.0.1.1

.1.0.0.0.0.0.0.1

.0.0.0.0.0.1.1.1

.1.1.1.0.0.0.0.0

.1.0.0.0.0.0.0.1

.1.1.0.0.0.1.0.1

.1.0.0.0.1.1.1.1

CROSSREFS

Sequence in context: A116521 A290900 A137500 * A034335 A337033 A190173

Adjacent sequences:  A146811 A146812 A146813 * A146815 A146816 A146817

KEYWORD

nonn,more

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified August 19 16:22 EDT 2022. Contains 356229 sequences. (Running on oeis4.)