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1,1
Row 3 of A232920
R. H. Hardin, Table of n, a(n) for n = 1..210
Empirical: a(n) = 3*a(n-1) +4*a(n-2) -2*a(n-3) for n>4
Some solutions for n=5
..2..2..2..1..2....0..1..0..0..0....1..2..2..2..1....2..1..2..1..2
..2..2..2..2..2....0..1..0..0..0....1..2..1..2..2....2..1..2..1..0
..2..2..1..2..2....2..1..0..1..0....1..0..1..2..2....2..1..2..1..2
Sequence in context: A043323 A033903 A175806 * A181874 A042444 A042442
Adjacent sequences: A232919 A232920 A232921 * A232923 A232924 A232925
nonn
R. H. Hardin, Dec 02 2013
approved