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A146184 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 87, 301, 1337, 5927, 24359, 118543, 715115, 5164241, 42357883, 353625469, 3347092839, 36905312969, 482588953149, 7069762004523, 114903134718451 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.0.0.0

.0.0.1.1.1.0.0.0

.0.1.0.1.1.0.0.0

.0.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.0

.0.0.0.1.1.0.1.0

.0.0.0.1.1.1.0.0

.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A146401 A146465 A147119 * A155274 A058058 A062748

Adjacent sequences:  A146181 A146182 A146183 * A146185 A146186 A146187

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified May 28 12:32 EDT 2020. Contains 334681 sequences. (Running on oeis4.)