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A199242
Number of nX4 0..2 arrays with values 0..2 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
1
3, 12, 25, 440, 2907, 7100, 134821, 934004, 2277108, 46296108, 330908530, 820702285, 17258404593, 125752465794, 315014793177, 6765057712760, 49918706666467, 125910537922412, 2743415189299833, 20425391744058298
OFFSET
1,1
COMMENTS
Column 4 of A199246
LINKS
EXAMPLE
Some solutions for n=5
..0..1..2..1....0..1..0..2....0..1..0..1....0..0..1..0....0..1..0..1
..2..0..1..2....2..2..1..0....1..2..1..2....0..0..2..1....1..0..1..2
..0..2..0..1....2..2..0..1....2..1..2..0....1..2..1..0....0..2..0..1
..2..0..1..0....0..1..1..2....0..2..0..2....2..1..2..1....2..0..2..0
..1..2..0..1....2..1..1..0....1..0..2..0....1..2..0..2....1..2..1..2
CROSSREFS
Sequence in context: A071355 A366984 A237650 * A326725 A169678 A294366
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 04 2011
STATUS
approved