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A221063
Equals one maps: number of 2Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..3 2Xn array
2
1, 8, 37, 172, 771, 3392, 14569, 61210, 252491, 1028162, 4152903, 16695976, 66953537, 268144582, 1073206163, 4293994258, 17178121515, 68716367280, 274872418553, 1099502006098, 4398029741851, 17592156966114, 70368693978927
OFFSET
1,2
COMMENTS
Row 2 of A221062
LINKS
FORMULA
Empirical: a(n) = 7*a(n-1) -12*a(n-2) -6*a(n-3) +26*a(n-4) -4*a(n-5) -17*a(n-6) +3*a(n-7) +4*a(n-8) for n>12
EXAMPLE
Some solutions for n=3
..0..0..0....0..1..1....1..1..1....0..0..1....1..0..1....0..1..0....0..0..0
..1..0..1....0..1..1....0..1..0....0..0..1....1..1..0....1..0..0....0..0..1
CROSSREFS
Sequence in context: A272739 A220917 A221891 * A221633 A201452 A128246
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 31 2012
STATUS
approved