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A146187 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-100 pattern in any orientation. 0
1, 1, 1, 1, 9, 39, 227, 1199, 6097, 63869, 840409, 12862601, 284127507, 7552975051, 252656207179, 10547338792841 (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

.0.0.1.1.0.1.1.0

.0.1.1.1.0.1.1.1

.1.0.0.1.0.1.0.0

.1.1.1.0.0.0.1.1

.1.1.0.0.0.1.1.1

.0.0.1.0.1.0.0.1

.1.1.1.0.1.1.1.0

.0.1.1.0.1.1.0.0

CROSSREFS

Sequence in context: A126396 A246065 A075210 * A173764 A331343 A002085

Adjacent sequences:  A146184 A146185 A146186 * A146188 A146189 A146190

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified July 7 13:21 EDT 2022. Contains 355148 sequences. (Running on oeis4.)