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A230678
Number of 4Xn 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j)
1
0, 423, 17271, 730503, 37034355, 1844154933, 91258562955, 4522036938501, 224105728666527, 11105653159056021, 550345235166102387, 27272655718068842535, 1351510936295338591335, 66974836192708860686913
OFFSET
1,2
COMMENTS
Row 4 of A230675
FORMULA
Empirical recurrence of order 64 (see link above)
EXAMPLE
Some solutions for n=3
..1..1..0....0..1..0....1..1..1....1..1..2....1..1..1....1..0..2....2..0..1
..1..2..0....0..2..1....2..0..1....1..0..2....0..2..0....1..1..2....1..1..2
..2..2..0....0..1..0....2..2..0....1..1..1....2..2..2....0..1..1....1..1..1
..0..0..2....1..0..2....0..2..0....0..2..1....2..0..0....1..2..1....0..2..1
CROSSREFS
Sequence in context: A206408 A238174 A251013 * A091293 A114808 A134218
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2013
STATUS
approved