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A147199 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 9, 25, 37, 77, 207, 663, 1517, 4967, 16733, 80643, 308521, 1536069, 6622503, 39983439, 198749745, 1357116341 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.0.1.1.1.0.1.1.1.0

.0.1.0.0.0.0.0.1.0

.1.1.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.0.0

.1.1.0.0.0.0.0.1.1

.0.1.0.0.0.0.0.1.0

.0.1.1.1.0.1.1.1.0

.0.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A044070 A348234 A226647 * A147403 A241764 A044451

Adjacent sequences:  A147196 A147197 A147198 * A147200 A147201 A147202

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 25 14:40 EST 2022. Contains 350572 sequences. (Running on oeis4.)