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A220961
Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 4Xn array
0
1, 94, 1224, 33708, 627760, 11214779, 190881959
OFFSET
1,2
COMMENTS
Row 4 of A220959
EXAMPLE
Some solutions for n=3
..0..1..0....0..1..1....1..0..0....0..0..0....0..0..1....1..0..0....0..1..0
..0..1..0....0..0..0....1..0..1....1..1..1....0..0..0....1..0..1....0..1..1
..1..0..0....0..0..0....0..1..0....0..0..0....0..1..1....1..1..1....1..0..0
..1..1..0....0..1..1....0..0..0....1..1..1....0..1..1....0..1..0....0..0..0
CROSSREFS
Sequence in context: A093294 A107613 A220797 * A218648 A278321 A189414
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 26 2012
STATUS
approved