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A195250
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Number of lower triangles of a 4X4 0..n array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less
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1
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1024, 59049, 190514, 357847, 533142, 709613, 886084, 1062555, 1239026, 1415497, 1591968, 1768439, 1944910, 2121381, 2297852, 2474323, 2650794, 2827265, 3003736, 3180207, 3356678, 3533149, 3709620, 3886091, 4062562, 4239033, 4415504, 4591975
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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) = 176471*n - 349213 for n>4
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EXAMPLE
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Some solutions for n=5
..2........5........3........0........5........1........2........3
..0.0......4.3......2.1......0.2......5.5......0.0......0.2......1.2
..1.2.1....4.3.1....0.2.2....0.1.3....5.5.3....0.2.1....1.1.1....2.0.2
..2.1.3.2..3.3.1.0..1.0.1.2..0.2.2.2..4.4.5.4..0.1.0.0..2.0.1.2..2.0.1.0
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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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