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A195213
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Number of lower triangles of an n X n integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by 1 or less and triangles differing by a constant counted only once
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2
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1, 7, 91, 2277, 111031, 10654607, 2021888119, 761408842173, 570411420721871, 851650667866314005, 2537743716708476573853, 15108768742290768272235707, 179885152873727967922701202921, 4286156683596201247493358770260469
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=5
...0...............0...............0...............0...............0
...1..0...........-1.-1...........-1..0...........-1..0............1..1
...0..0..1........-2.-2.-1........-1..0..1.........0..0.-1.........0..1..0
...0..1..1..1.....-1.-1.-1.-2......0..0..0..1......1..0.-1.-2......0..1..1..0
...1..0..1..0..0..-1.-1.-2.-1.-2...0..0..1..1..2...1..0.-1.-2.-1...0..0..1..1..0
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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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