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A146736 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 19, 45, 71, 181, 579, 2359, 9473, 49633, 219719, 1381673, 7390193, 56382323, 390282737, 3729442205, 31973256841 (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

.0.0.0.0.1.1.1.0

.1.0.0.1.1.1.0.0

.1.1.1.0.0.1.0.0

.1.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.1

.0.0.1.0.0.1.1.1

.0.0.1.1.1.0.0.1

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A146616 A146395 A154302 * A176358 A045458 A120289

Adjacent sequences:  A146733 A146734 A146735 * A146737 A146738 A146739

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 25 16:01 EST 2022. Contains 350572 sequences. (Running on oeis4.)