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A146817 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1110-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 65, 65, 429, 429, 5631, 5631, 146823, 146823, 4351701, 4351701, 186793381, 186793381 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.1.0.0.0.0.0.0.0.1

.1.1.1.0.0.0.1.1.1

.0.1.1.1.0.1.1.1.0

.0.0.0.0.0.0.0.0.0

.0.1.1.1.0.1.1.1.0

.1.1.1.0.0.0.1.1.1

.1.0.0.0.0.0.0.0.1

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146048 A146809 A147233 * A146660 A070852 A146596

Adjacent sequences:  A146814 A146815 A146816 * A146818 A146819 A146820

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified July 2 21:48 EDT 2022. Contains 355029 sequences. (Running on oeis4.)