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A140176
Half the number of n X n symmetric binary matrices with adjacent rows differing in at most one position.
0
1, 3, 8, 17, 36, 71, 144, 289, 594, 1231, 2602, 5573, 12128, 26727, 59668, 134729, 307618, 709503, 1652402, 3883445, 9206712
OFFSET
1,2
CROSSREFS
Sequence in context: A369734 A147419 A106691 * A238496 A097391 A202554
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 15 2008
STATUS
approved