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A146181 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-111-100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 133, 283, 2411, 6513, 104581, 308359, 31267501, 125706815, 30388182025, 158816649115, 38510941635475, 255401019744941, 142458224930527429, 1198142574949310095, 2063515953281030710129 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.1.1.1.0.0.1.1.1

.1.1.0.0.0.0.1.1

.0.1.0.0.0.0.1.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A254692 A050882 A146233 * A105984 A115518 A064903

Adjacent sequences:  A146178 A146179 A146180 * A146182 A146183 A146184

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified August 2 21:30 EDT 2021. Contains 346429 sequences. (Running on oeis4.)