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A209606
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Number of nX4 1..2 arrays with every element value z a city block distance of exactly z from another element value z
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1
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2, 45, 955, 11879, 151736, 1947347, 24912066, 322047969, 4162324219, 53725706448, 693454797025, 8950269164167, 115522311347383, 1491104128677150, 19246371866665817, 248421180186787884, 3206476873520078239
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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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EXAMPLE
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Some solutions for n=4
..1..1..1..2....1..1..1..2....2..2..2..2....1..1..2..2....2..2..2..1
..2..2..2..2....1..1..2..1....2..2..2..1....1..2..2..2....2..2..1..1
..2..2..2..1....1..1..2..1....2..1..2..1....1..2..2..1....1..2..2..2
..2..1..1..1....1..2..2..2....1..1..2..1....1..2..2..1....1..2..2..2
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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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