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A146427 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 15, 29, 65, 155, 571, 2003, 10561, 41709, 230027, 1186171, 9353621, 63521901, 612736753, 4999574693, 59290750729, 622330543047 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.1.0

.1.0.1.0.0.1.0.0

.1.1.1.1.0.1.1.0

.0.0.0.0.0.1.0.0

.0.0.1.0.0.0.0.0

.0.1.1.0.1.1.1.1

.0.0.1.0.0.1.0.1

.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A104811 A131877 A211324 * A202512 A014095 A192356

Adjacent sequences:  A146424 A146425 A146426 * A146428 A146429 A146430

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 20 05:54 EDT 2021. Contains 348099 sequences. (Running on oeis4.)