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 A221290 T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 nXk 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 (list; table; graph; refs; listen; history; text; internal format)
 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 R. H. Hardin, Table of n, a(n) for n = 1..70 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: A236471 A220328 A220935 * A078739 A004597 A077623 Adjacent sequences: A221287 A221288 A221289 * A221291 A221292 A221293 KEYWORD nonn,tabl AUTHOR R. H. Hardin Jan 09 2013 STATUS approved

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Last modified June 9 00:10 EDT 2023. Contains 363165 sequences. (Running on oeis4.)