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A231452
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Number of (2+1)X(n+1) 0..3 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with values 0..3 introduced in row major order
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1
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6, 15, 32, 87, 229, 647, 1829, 5293, 15405, 45267, 133622, 396229, 1178280, 3512183, 10486280, 31348643, 93802627, 280872905, 841438827, 2521717541, 7559421071, 22665628739, 67969023714, 203845636065, 611401428290, 1833905526365
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 6*a(n-1) -7*a(n-2) -20*a(n-3) +52*a(n-4) -14*a(n-5) -69*a(n-6) +56*a(n-7) +24*a(n-8) +14*a(n-9) -81*a(n-10) +112*a(n-12) -6*a(n-13) -3*a(n-14) -36*a(n-15) -27*a(n-16)
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EXAMPLE
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Some solutions for n=6
..0..0..0..1..1..1..0....0..0..1..1..1..2..2....0..0..0..0..1..1..2
..0..0..1..1..1..0..0....0..1..1..1..2..2..3....0..0..0..1..1..2..3
..0..1..1..1..0..0..0....3..3..3..3..3..3..3....2..2..2..2..2..3..3
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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