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A146608 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 9, 21, 41, 85, 247, 661, 2133, 7669, 30043, 131633, 623713, 3176911, 18218893, 109622217, 754540743, 5491953507, 45422445535 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.0.0

.0.0.0.1.0.1.0.0

.1.1.1.1.0.1.0.0

.1.0.0.0.0.1.1.0

.0.1.1.0.0.0.0.1

.0.0.1.0.1.1.1.1

.0.0.1.0.1.0.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A100135 A024173 A097119 * A161214 A213396 A011843

Adjacent sequences:  A146605 A146606 A146607 * A146609 A146610 A146611

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 18 01:52 EDT 2022. Contains 353779 sequences. (Running on oeis4.)