login
A249702
Number of length n+3 0..3 arrays with every four consecutive terms having the maximum of some two terms equal to the minimum of the remaining two terms
1
100, 208, 440, 896, 1724, 3440, 7056, 14544, 29620, 60416, 124156, 256448, 529304, 1091952, 2255920, 4669824, 9673196, 20037568, 41516752, 86070656, 178513920, 370298992, 768179120, 1593817584, 3307416676, 6864100336, 14246134420
OFFSET
1,1
COMMENTS
Column 3 of A249707
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) -a(n-2) +12*a(n-4) -10*a(n-5) -41*a(n-8) -6*a(n-9) -2*a(n-10) +2*a(n-11) +44*a(n-12) +36*a(n-13) +16*a(n-14) -24*a(n-16) -24*a(n-17)
EXAMPLE
Some solutions for n=6
..1....1....3....1....0....1....1....1....2....2....1....1....2....0....2....0
..2....2....2....2....1....1....0....1....2....1....0....1....2....3....2....2
..2....2....0....2....2....1....2....2....3....2....1....1....2....1....3....3
..3....2....2....2....1....0....1....1....1....2....1....1....2....1....2....2
..2....1....2....3....1....2....1....1....2....2....1....3....2....0....2....0
..2....3....3....0....0....1....1....1....2....2....1....0....2....1....2....2
..2....2....1....2....1....1....1....1....2....0....1....1....1....1....3....2
..3....2....2....2....2....1....0....0....3....3....0....1....3....1....2....3
..0....1....2....2....1....3....3....3....1....2....3....3....2....0....2....2
CROSSREFS
Sequence in context: A181568 A308306 A235272 * A188245 A122467 A185792
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2014
STATUS
approved