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A281765
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T(n,k)=Number of nXk 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
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12
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0, 0, 0, 2, 4, 0, 2, 14, 10, 0, 5, 40, 47, 20, 0, 8, 110, 152, 90, 38, 0, 15, 280, 609, 560, 201, 68, 0, 26, 698, 2138, 2808, 1872, 374, 120, 0, 46, 1696, 7466, 13968, 12191, 5948, 672, 208, 0, 80, 4052, 25798, 68362, 85844, 49986, 18358, 1172, 358, 0, 139, 9564, 87397
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OFFSET
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1,4
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COMMENTS
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Table starts
.0...0....2......2........5.........8..........15...........26.............46
.0...4...14.....40......110.......280.........698.........1696...........4052
.0..10...47....152......609......2138........7466........25798..........87397
.0..20...90....560.....2808.....13968.......68362.......323280........1529974
.0..38..201...1872....12191.....85844......589990......3845590.......25703392
.0..68..374...5948....49986....502276.....4845178.....43943360......414035752
.0.120..672..18358...201450...2848436....38998648....491290688.....6531040026
.0.208.1172..55048...795220..15817652...306847534...5380228500...100838834642
.0.358.2015.162120..3098932..86332266..2376142873..58064622712..1533079336619
.0.612.3442.471340.11944444.465260812.18172170592.619082149716.23019093115418
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LINKS
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FORMULA
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Empirical for column k:
k=1: a(n) = a(n-1)
k=2: a(n) = 3*a(n-1) -a(n-2) -3*a(n-3) +a(n-4) +a(n-5)
k=3: a(n) = 4*a(n-1) -4*a(n-2) -2*a(n-3) +4*a(n-4) -a(n-6) for n>11
k=4: [order 29] for n>32
k=5: [order 48] for n>57
Empirical for row n:
n=1: a(n) = 2*a(n-1) +a(n-2) -2*a(n-3) -a(n-4) for n>5
n=2: [order 9]
n=3: [order 40] for n>41
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EXAMPLE
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Some solutions for n=4 k=4
..0..0..0..0. .0..0..1..1. .0..0..1..0. .0..1..0..0. .0..1..1..0
..0..0..1..1. .0..1..1..1. .0..1..0..1. .1..0..1..1. .0..0..1..1
..1..1..1..1. .0..0..1..1. .1..1..1..0. .0..1..1..1. .0..0..1..1
..1..1..0..1. .0..1..1..1. .1..1..0..0. .1..0..1..1. .0..1..1..1
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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