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A146247 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-010 pattern in any orientation. 0
1, 1, 1, 1, 7, 21, 73, 363, 1597, 12869, 120523, 1325159, 19641005, 334866625, 7674660113, 211567083435, 7388903356109, 318730605323017, 17659730470419149 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..19.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

.1.1.0.0.0.0.1.1

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.1.1.0.0.0.0.1.1

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A208534 A135576 A153497 * A241431 A147003 A110683

Adjacent sequences:  A146244 A146245 A146246 * A146248 A146249 A146250

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified May 22 14:32 EDT 2019. Contains 323480 sequences. (Running on oeis4.)