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A147419 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-0110 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 8, 17, 36, 53, 124, 323, 1007, 2889, 11702, 39960, 173688, 672545, 3448944, 15619066, 95906062, 522271313, 3756284779, 24152062634 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.0.1.0.0.1

.0.1.1.0.1.1.1.1

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.0.0

.0.0.0.0.0.0.1.1

.0.1.1.0.0.1.1.0

.1.1.1.1.0.1.1.0

.1.0.0.1.0.0.1.1

CROSSREFS

Sequence in context: A159217 A052996 A112523 * A106691 A140176 A238496

Adjacent sequences:  A147416 A147417 A147418 * A147420 A147421 A147422

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 19 12:57 EDT 2019. Contains 327198 sequences. (Running on oeis4.)