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A147153 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1100-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 5, 29, 53, 103, 395, 1381, 4229, 19741, 89165, 570891, 3054965, 21029525, 147769545, 1255506947 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.0.0.0

.0.0.1.0.1.1.0.0

.0.1.1.1.0.1.1.0

.1.1.0.0.0.1.0.1

.1.0.1.0.0.0.1.1

.0.1.1.0.1.1.1.0

.0.0.1.1.0.1.0.0

.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A224499 A107003 A141374 * A300777 A177831 A115706

Adjacent sequences:  A147150 A147151 A147152 * A147154 A147155 A147156

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified September 22 16:01 EDT 2020. Contains 337291 sequences. (Running on oeis4.)