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A199194
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Number of nX1 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors
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2
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1, 1, 1, 1, 6, 21, 41, 36, 281, 1051, 2056, 1721, 15131, 58951, 115631, 94376, 887643, 3551235, 6981925, 5609649, 55101276, 224543335, 442311619, 351574834, 3559509379, 14702228029, 29006278734, 22875971289, 236833911819
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OFFSET
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1,5
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COMMENTS
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Column 1 of A199201
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..148
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EXAMPLE
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Some solutions for n=7
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....1....1....1....1....1....1....1....1....1....1....1....1....1
..2....2....0....0....2....0....2....2....2....2....2....2....2....2....2....2
..0....0....2....2....3....1....3....1....1....3....0....3....3....3....3....1
..2....3....3....1....2....2....1....3....2....0....1....1....2....1....0....0
..3....2....1....2....1....3....0....0....0....2....3....3....0....2....3....3
..1....1....2....3....3....2....3....3....3....1....2....2....1....0....1....2
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CROSSREFS
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Sequence in context: A007339 A225150 A056237 * A268223 A048036 A272671
Adjacent sequences: A199191 A199192 A199193 * A199195 A199196 A199197
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Nov 03 2011
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STATUS
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approved
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