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URL: https://oeis.org/A221290

⇱ A221290 - OEIS

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A221290
T(n,k) = Equals two maps: number of n X k binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 n X k array.
9
1, 1, 1, 2, 4, 1, 4, 16, 12, 1, 7, 52, 92, 37, 1, 12, 200, 673, 556, 114, 1, 21, 792, 5912, 9107, 3332, 351, 1, 37, 3080, 48298, 172904, 123958, 19996, 1081, 1, 65, 12164, 396846, 2890017, 4983598, 1686304, 119972, 3329, 1, 114, 47827, 3240527, 49684593
OFFSET
1,4
COMMENTS
Table starts
.1.....1.......2.........4..........7..........12.........21........37
.1.....4......16........52........200.........792.......3080.....12164
.1....12......92.......673.......5912.......48298.....396846...3240527
.1....37.....556......9107.....172904.....2890017...49684593.821323042
.1...114....3332....123958....4983598...172905144.6138441061
.1...351...19996...1686304..143511784.10344276279
.1..1081..119972..22931365.4129628435
.1..3329..719836.311813067
.1.10252.4319012
.1.31572
.1
LINKS
EXAMPLE
Some solutions for n=3, k=4
..0..0..1..0....0..0..0..0....0..1..0..0....0..0..0..1....0..0..0..1
..0..0..1..0....0..1..0..0....1..0..1..0....0..0..0..0....1..0..0..0
..0..1..0..0....1..0..1..0....1..1..1..0....1..1..0..0....1..1..0..0
CROSSREFS
Column 2 is A099098.
Column 3 is A220932.
Column 4 is A220933.
Row 1 is A005251(n+1).
Row 2 is A220936.
Sequence in context: A381727 A220328 A220935 * A078739 A004597 A077623
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Jan 09 2013
STATUS
approved