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A146664 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 19, 43, 87, 303, 1077, 3757, 15681, 80673, 475263, 2975253, 20229343, 160250909, 1366441107, 13345035623 (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

.0.0.0.0.0.1.1.0

.1.0.0.1.1.1.0.0

.1.1.0.1.0.0.0.0

.0.1.0.0.0.1.1.0

.0.1.1.0.0.0.1.0

.0.0.0.0.1.0.1.1

.0.0.1.1.1.0.0.1

.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A146704 A103145 A100694 * A028880 A162905 A201875

Adjacent sequences:  A146661 A146662 A146663 * A146665 A146666 A146667

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 25 11:16 EDT 2021. Contains 348249 sequences. (Running on oeis4.)