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A145762
Number of n X n binary arrays symmetric about the diagonal and under 90-degree rotation with all ones connected only either three adjacent vertically or three adjacent horizontally.
0
1, 1, 1, 1, 2, 1, 4, 1, 11, 3, 36, 8, 178, 27, 1006, 96, 7478, 569, 70926, 4093, 898687, 37611, 14257237, 421080, 292647869, 6366190, 7706237478, 123605120, 263373760591, 3088656877
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OFFSET
1,5
LINKS
Table of n, a(n) for n=1..30.
CROSSREFS
Sequence in context:
A243913
A186724
A145930
*
A024539
A128271
A092891
Adjacent sequences:
A145759
A145760
A145761
*
A145763
A145764
A145765
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Oct 17 2008
STATUS
approved
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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)