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A206343
T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor
9
192, 96, 96, 455, 181, 455, 296, 232, 232, 296, 1376, 534, 1340, 534, 1376, 880, 686, 682, 682, 686, 880, 4111, 1589, 4007, 1581, 4007, 1589, 4111, 2622, 2042, 2030, 2034, 2034, 2030, 2042, 2622, 12319, 4751, 12005, 4711, 12021, 4711, 12005, 4751, 12319
OFFSET
1,1
COMMENTS
Table starts
..192...96...455...296..1376...880...4111...2622..12319...7854..36945...23550
...96..181...232...534...686..1589...2042...4751...6110..14239..18318...42705
..455..232..1340...682..4007..2030..12005...6074..35999..18206.107983...54606
..296..534...682..1581..2034..4711...6078..14101..18210..42271..54606..126799
.1376..686..4007..2034.12021..6090..36015..18222.107997..54618.323943..163806
..880.1589..2030..4711..6090.14181..18258..42351..54654.126861.163842..380391
.4111.2042.12005..6078.36015.18258.108141..54762.324087.163950.971925..491514
.2622.4751..6074.14101.18222.42351..54762.127581.164274.381111.491838.1141701
LINKS
FORMULA
Empirical for column k:
k=1: a(n) = a(n-1) +3*a(n-2) -3*a(n-3) for n>10
k=2: a(n) = a(n-1) +3*a(n-2) -3*a(n-3) for n>11
k=3: a(n) = a(n-1) +3*a(n-2) -3*a(n-3) for n>12
k=4: a(n) = a(n-1) +3*a(n-2) -3*a(n-3) for n>13
k=5: a(n) = a(n-1) +3*a(n-2) -3*a(n-3) for n>14
k=6: a(n) = a(n-1) +3*a(n-2) -3*a(n-3) for n>15
k=7: a(n) = a(n-1) +3*a(n-2) -3*a(n-3) for n>16
apparently a(n-1)+3*a(n-2)-3*a(n-3) for n>k+9
EXAMPLE
Some solutions for n=4 k=3
..3..1..3..1....3..2..3..2....0..2..0..1....1..3..0..1....1..1..0..2
..1..3..1..3....2..3..2..3....2..0..2..0....1..0..3..0....3..0..1..0
..3..1..3..1....3..2..3..2....0..2..0..2....0..1..0..3....0..3..0..1
..1..3..1..3....2..3..2..3....1..0..2..0....1..0..1..0....2..0..3..0
..3..1..3..1....3..2..3..2....0..1..0..2....0..1..0..1....0..2..0..3
CROSSREFS
Sequence in context: A155843 A187527 A187698 * A206336 A206335 A289219
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Feb 06 2012
STATUS
approved