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A194927
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Number of lower triangles of an n X n 0..4 array with no element differing from any of its horizontal or vertical neighbors by more than one
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1
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5, 35, 557, 19379, 1481501, 248381815, 91397735301, 73818960495633, 130889487125186283, 509545270244514585603, 4355460540545035980173055, 81748120032524783307283152379, 3369206664229541719414619846139771
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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 4X4
..3........1........1........3........2........3........3........4
..3.2......2.3......2.2......3.2......2.1......2.1......3.3......3.4
..2.1.2....2.3.3....3.3.2....4.3.3....1.1.2....3.2.1....4.4.3....2.3.2
..2.2.1.2..3.2.3.4..2.2.2.3..4.3.3.3..2.2.3.2..2.1.2.2..4.3.4.3..1.2.1.2
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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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