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A223053
Number of 2Xn 0..3 arrays with exactly floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order
1
0, 4, 44, 508, 6918, 93770, 1302140, 18203855, 255963118, 3621617164, 51457102852, 733976768254, 10502362067962, 150690052903934, 2167251949580988, 31234643654675360, 450981145373780394, 6522104011884246116
OFFSET
1,2
COMMENTS
Row 2 of A223052
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0....0..1..2....0..1..0....0..0..1....0..1..0....0..0..1....0..1..0
..1..1..2....2..0..0....1..1..0....1..0..1....2..0..3....2..0..1....2..2..2
CROSSREFS
Sequence in context: A087813 A342346 A082779 * A222288 A053315 A005721
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 13 2013
STATUS
approved