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A302324
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Number of 3 X n 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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1
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4, 25, 65, 177, 519, 1528, 4509, 13329, 39609, 117981, 351994, 1051660, 3146513, 9424435, 28252647, 84757174, 254424013, 764109856, 2295781145, 6900025071, 20743913296, 62377653458, 187606559148, 564330015524, 1697745322295, 5108065042362, 15370102161553, 46251622171599
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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) = 5*a(n-1) -4*a(n-2) -6*a(n-3) +a(n-4) -15*a(n-5) +25*a(n-6) +37*a(n-7) +8*a(n-8) -27*a(n-9) -57*a(n-10) -49*a(n-11) +51*a(n-12) +44*a(n-13) -12*a(n-14) for n>15.
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EXAMPLE
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Some solutions for n=5:
..0..0..0..1..1. .0..1..0..1..1. .0..0..0..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..1..0..0..1. .1..1..1..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..0..0..1..0. .1..1..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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