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A146059 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 2X3 U in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 1, 5, 1, 11, 5, 41, 13, 189, 31, 927, 133, 5603, 759, 45359, 5033, 469791, 38887, 5816617, 382421, 90000163, 4832387, 1751237935, 75700651 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.0.0.1.0.1.0.0.0

.0.0.0.1.1.1.0.0.0

.0.1.1.0.0.0.1.1.0

.0.0.1.0.0.0.1.0.0

.0.1.1.0.0.0.1.1.0

.0.0.0.1.1.1.0.0.0

.0.0.0.1.0.1.0.0.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A133730 A112031 A146285 * A046531 A289310 A160085

Adjacent sequences:  A146056 A146057 A146058 * A146060 A146061 A146062

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified April 18 22:08 EDT 2019. Contains 322237 sequences. (Running on oeis4.)