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A146728 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 13, 31, 59, 133, 487, 1853, 8419, 38423, 183353, 1033531, 6717069, 50468649, 417543651, 3765006993, 38269269195, 435116516817 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.0

.0.0.1.1.0.1.0.0

.1.1.0.0.0.0.1.0

.1.0.0.0.0.0.1.1

.1.1.0.0.0.0.0.1

.0.1.0.0.0.0.1.1

.0.0.1.0.1.1.0.0

.0.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A054554 A051939 A257764 * A082709 A154833 A106090

Adjacent sequences:  A146725 A146726 A146727 * A146729 A146730 A146731

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified April 3 22:48 EDT 2020. Contains 333207 sequences. (Running on oeis4.)