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A146419 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 9, 24, 33, 92, 207, 751, 1987, 9135, 27247, 151575, 553091, 3687021, 16183258, 127736835, 672115551, 6393532548, 40630854716, 467493592708 (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

.0.1.1.1.0.0.0.0

.0.0.1.0.0.0.0.1

.0.0.1.0.1.1.1.1

.0.0.1.0.0.0.0.1

.1.0.0.0.0.1.0.0

.1.1.1.1.0.1.0.0

.1.0.0.0.0.1.0.0

.0.0.0.0.1.1.1.0

CROSSREFS

Sequence in context: A271543 A272256 A132354 * A162907 A165345 A177240

Adjacent sequences:  A146416 A146417 A146418 * A146420 A146421 A146422

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified February 27 19:10 EST 2020. Contains 332308 sequences. (Running on oeis4.)