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A146459 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 9, 19, 53, 91, 437, 1171, 6755, 23673, 190687, 829933, 7917835, 43969469, 541189453, 3877768971, 62027074701, 569529515425 (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

.0.0.0.0.1.0.0.0

.0.0.1.0.1.1.0.0

.0.1.1.1.0.1.1.0

.1.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.1

.0.1.1.0.1.1.1.0

.0.0.1.1.0.1.0.0

.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A043902 A048696 A046103 * A308025 A041158 A146080

Adjacent sequences:  A146456 A146457 A146458 * A146460 A146461 A146462

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 23 12:04 EDT 2021. Contains 347615 sequences. (Running on oeis4.)