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A199197
Number of nX4 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
0
1, 21, 447, 11734, 341015, 10692835, 351517665, 11945622271, 415824209261, 14744482818827, 530560208277339, 19323001059102859, 710881996757208605
OFFSET
1,2
COMMENTS
Column 4 of A199201
EXAMPLE
Some solutions for n=5
..0..1..0..1....0..1..0..1....0..1..0..2....0..1..0..2....0..1..0..2
..2..3..1..2....1..2..3..0....2..3..2..1....3..2..1..3....2..3..2..3
..3..2..0..3....0..3..2..2....0..1..3..0....2..0..2..1....0..1..1..0
..0..3..1..2....3..1..2..2....2..3..1..2....3..2..1..3....3..1..1..2
..3..1..2..0....1..3..0..3....3..0..3..1....0..3..0..1....2..3..0..3
CROSSREFS
Sequence in context: A041842 A215152 A199252 * A219419 A157014 A076552
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 03 2011
STATUS
approved