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A298149
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Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.
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1
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3, 4, 6, 18, 15, 104, 227, 510, 2020, 4986, 13983, 45252, 121009, 355706, 1066100, 2988274, 8793219, 25704770, 73650585, 215512322, 625817974, 1809132934, 5271836919, 15292220940, 44347166183, 128947693186, 374125678734
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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) = 2*a(n-1) +3*a(n-2) +10*a(n-3) -28*a(n-4) -18*a(n-5) -8*a(n-6) +63*a(n-7) +42*a(n-8) -52*a(n-9) +9*a(n-10) +26*a(n-11) -23*a(n-12) -43*a(n-13) -11*a(n-14) -20*a(n-15) +9*a(n-16) +18*a(n-17) +2*a(n-18) for n>19
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EXAMPLE
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Some solutions for n=7
..0..1..0. .0..1..0. .0..0..1. .0..1..1. .0..0..1. .0..1..0. .0..0..0
..0..1..0. .1..1..1. .0..0..1. .0..1..1. .0..0..1. .1..1..1. .0..0..0
..0..0..0. .0..1..0. .0..1..1. .1..1..0. .1..1..1. .0..1..0. .0..0..0
..1..0..1. .1..1..0. .0..1..0. .0..1..1. .0..0..1. .1..1..0. .1..1..1
..1..0..1. .0..1..1. .1..1..0. .1..1..0. .0..0..1. .1..0..0. .1..1..1
..0..0..0. .1..1..0. .0..1..1. .0..1..1. .0..1..1. .1..1..0. .1..1..1
..0..0..1. .1..1..0. .0..1..1. .0..1..1. .0..1..1. .1..1..0. .1..1..1
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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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