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A240347
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T(n,k)=Number of nXk 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or three plus the sum of the elements diagonally to its northwest, modulo 4
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6
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2, 4, 4, 8, 18, 8, 16, 78, 78, 16, 32, 334, 722, 334, 32, 64, 1418, 6376, 6376, 1418, 64, 128, 6002, 55680, 115194, 55680, 6002, 128, 256, 25374, 483926, 2044806, 2044806, 483926, 25374, 256, 512, 107230, 4195892, 36002110, 73440130, 36002110, 4195892
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OFFSET
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1,1
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COMMENTS
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Table starts
....2.......4..........8............16..............32..............64
....4......18.........78...........334............1418............6002
....8......78........722..........6376...........55680..........483926
...16.....334.......6376........115194.........2044806........36002110
...32....1418......55680.......2044806........73440130......2607237326
...64....6002.....483926......36002110......2607237326....186214281670
..128...25374....4195892.....631121148.....92003133794..13200773101956
..256..107230...36331704...11038084086...3236101836296.932020621734728
..512..453098..314419494..192823850946.113624636162418
.1024.1914498.2720368268.3366365227614
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LINKS
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FORMULA
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Empirical for column k:
k=1: a(n) = 2*a(n-1)
k=2: a(n) = 6*a(n-1) -7*a(n-2) -4*a(n-3) +8*a(n-4)
k=3: [order 23]
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EXAMPLE
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Some solutions for n=4 k=4
..2..0..0..0....0..0..0..0....2..0..0..2....0..0..0..2....2..2..2..0
..0..0..2..0....0..0..2..2....0..3..2..0....2..0..0..0....2..2..2..0
..2..0..2..2....2..2..2..2....2..1..1..2....2..2..0..0....0..3..2..0
..0..0..0..2....2..0..2..3....2..2..2..2....2..0..0..0....2..2..2..2
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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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