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A202798
Number of nX4 binary arrays with every one adjacent to another one horizontally or vertically
1
7, 126, 1718, 22946, 311144, 4217066, 57127796, 773948962, 10485233258, 142050385280, 1924452482144, 26071860295098, 353213105139604, 4785216541174944, 64828561353680056, 878276318748587482
OFFSET
1,1
COMMENTS
Column 4 of A202802
LINKS
FORMULA
Empirical: a(n) = 13*a(n-1) -7*a(n-2) +181*a(n-3) +123*a(n-4) +940*a(n-5) +545*a(n-6) -2084*a(n-7) -1964*a(n-8) +1512*a(n-9) +1984*a(n-10) -512*a(n-11) -1024*a(n-12)
EXAMPLE
Some solutions for n=4
..0..0..1..1....1..1..0..0....1..1..1..0....0..1..1..0....0..0..0..0
..1..0..0..1....0..0..0..0....0..0..1..1....0..0..1..0....1..0..1..1
..1..1..1..0....0..0..1..1....1..1..1..0....0..0..0..0....1..1..0..0
..0..1..0..0....0..0..1..0....1..0..1..0....0..0..1..1....0..1..1..0
CROSSREFS
Sequence in context: A113162 A180583 A295412 * A204248 A084940 A246648
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 24 2011
STATUS
approved