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A280394
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Number of nX4 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
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1
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2, 16, 238, 3002, 35676, 410670, 4627308, 51310794, 561854184, 6090082758, 65460724868, 698687410882, 7412843182912, 78243277276350, 822166850058812, 8605199231211962, 89752467840352056, 933213129479013558
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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) = 34*a(n-1) -481*a(n-2) +3880*a(n-3) -20944*a(n-4) +82088*a(n-5) -243952*a(n-6) +563264*a(n-7) -1021840*a(n-8) +1458048*a(n-9) -1621632*a(n-10) +1371136*a(n-11) -839936*a(n-12) +335872*a(n-13) -65536*a(n-14) for n>15
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EXAMPLE
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Some solutions for n=4
..0..0..0..0. .0..0..0..0. .0..0..1..1. .0..0..0..0. .0..0..0..0
..0..1..1..1. .1..1..0..2. .0..1..0..0. .1..1..1..1. .1..1..0..1
..1..2..1..1. .1..1..2..2. .0..0..0..2. .1..2..2..1. .1..0..1..0
..0..0..0..0. .1..1..1..1. .2..2..2..2. .2..2..2..2. .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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