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A240381
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T(n,k)=Number of nXk 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4
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10
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2, 2, 4, 4, 10, 10, 4, 38, 44, 22, 8, 90, 330, 148, 50, 8, 366, 1494, 2066, 636, 114, 16, 878, 12234, 17550, 16994, 2430, 258, 16, 3606, 57722, 279886, 281186, 116030, 9648, 586, 32, 8666, 477574, 2545618, 8802558, 3502886, 884792, 37946, 1330, 32, 35602
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OFFSET
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1,1
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COMMENTS
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Table starts
....2......2.........4............4.............8..............8.............16
....4.....10........38...........90...........366............878...........3606
...10.....44.......330.........1494.........12234..........57722.........477574
...22....148......2066........17550........279886........2545618.......41758418
...50....636.....16994.......281186.......8802558......157432290.....5145703760
..114...2430....116030......3502886.....207932244.....7149227810...457988195982
..258...9648....884792.....52375114....6169009514...422227556156.54164128056204
..586..37946...6273952....672652728..148090588518.19320096061230
.1330.149336..46648918...9771038498.4275011910288
.3018.588102.335571098.127878632630
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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) +2*a(n-2) +2*a(n-3)
k=2: [order 14] for n>15
Empirical for row n:
n=1: a(n) = 2*a(n-2)
n=2: a(n) = 12*a(n-2) -24*a(n-4) +31*a(n-6) -16*a(n-8)
n=3: [order 48] for n>50
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EXAMPLE
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Some solutions for n=4 k=4
..1..3..1..3....3..1..1..3....3..1..3..1....3..1..3..1....1..3..1..3
..1..3..1..3....3..0..2..0....3..1..2..1....3..0..2..0....1..2..2..2
..1..2..1..1....3..2..0..2....3..2..2..2....1..0..0..0....1..2..0..0
..3..0..0..2....2..0..0..0....1..0..0..0....2..0..1..2....2..3..2..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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