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A147065 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01010-11111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 4, 7, 20, 27, 84, 153, 692, 1605, 7549, 19036, 103045, 315223, 2201412, 8341738, 68161042, 299153867, 2851751081, 14915115066 (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

.0.1.0.0.1.0.1.0

.1.1.0.1.1.1.1.1

.0.1.0.0.0.0.0.0

.1.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.1

.0.0.0.0.0.0.1.0

.1.1.1.1.1.0.1.1

.0.1.0.1.0.0.1.0

CROSSREFS

Sequence in context: A045548 A090879 A084404 * A049947 A266822 A296624

Adjacent sequences:  A147062 A147063 A147064 * A147066 A147067 A147068

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 27 16:38 EST 2022. Contains 350611 sequences. (Running on oeis4.)