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A146379
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 13, 25, 41, 95, 289, 1010, 4113, 15296, 63783, 305771, 1708813, 10377230, 69118879, 490255119, 4001984029, 36100718210, 369478821921, 4060660472495, 50042558173907
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OFFSET
1,7
LINKS
Table of n, a(n) for n=1..26.
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.0.0.0.0
.0.0.1.1.1.1.0.0
.0.1.0.1.0.0.1.0
.0.1.0.0.0.1.1.1
.1.1.1.0.0.0.1.0
.0.1.0.0.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.0.1.0.0.0
CROSSREFS
Sequence in context:
A144826
A030552
A146371
*
A056714
A120074
A056706
Adjacent sequences:
A146376
A146377
A146378
*
A146380
A146381
A146382
KEYWORD
nonn
AUTHOR
R. H. Hardin
STATUS
approved
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Last modified September 3 16:39 EDT 2024. Contains 375672 sequences. (Running on oeis4.)