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A199194
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
2
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
OFFSET
1,5
COMMENTS
Column 1 of A199201
LINKS
EXAMPLE
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
CROSSREFS
Sequence in context: A056237 A364169 A364171 * A268223 A048036 A272671
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 03 2011
STATUS
approved