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A140178
Half the number of n X n symmetric binary matrices with adjacent rows differing in at most three positions.
0
1, 4, 32, 427, 7396, 130612, 2097152, 30417025, 409957616, 5282779354
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A298694
A222685
A322735
*
A366685
A088991
A009668
Adjacent sequences:
A140175
A140176
A140177
*
A140179
A140180
A140181
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Jun 15 2008
STATUS
approved
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Last modified May 9 07:44 EDT 2024. Contains 372346 sequences. (Running on oeis4.)