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A147033 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 5, 31, 53, 91, 191, 751, 2485, 12125, 48629, 262319, 1174125, 7756611, 44436085, 360750867, 2552407571 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.1.0.0

.0.0.1.1.0.1.0.0

.1.1.1.0.1.1.1.1

.0.0.1.0.0.0.1.0

.0.1.0.0.0.1.0.0

.1.1.1.1.0.1.1.1

.0.0.1.0.1.1.0.0

.0.0.1.0.0.1.0.0

CROSSREFS

Sequence in context: A130474 A238674 A245523 * A125743 A332788 A333243

Adjacent sequences: A147030 A147031 A147032 * A147034 A147035 A147036

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 26 21:15 EST 2022. Contains 358362 sequences. (Running on oeis4.)