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A206340 Number of (n+1)X6 0..3 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor 1
1376, 686, 4007, 2034, 12021, 6090, 36015, 18222, 107997, 54618, 323943, 163806, 971799, 491406, 2915385, 1474206, 8746143, 4422606, 26238417, 13267806, 78715239, 39803406, 236145705, 119410206, 708437103, 358230606, 2125311297 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A206343
LINKS
FORMULA
Empirical: a(n) = a(n-1) +3*a(n-2) -3*a(n-3) for n>14
EXAMPLE
Some solutions for n=4
..0..1..0..2..0..2....1..2..1..2..1..2....1..1..0..2..0..1....1..0..1..0..2..0
..1..0..1..0..2..0....2..1..2..1..2..1....2..0..1..0..2..0....0..1..0..1..0..2
..0..1..0..1..0..2....1..2..1..2..1..2....0..2..0..1..0..2....1..0..1..0..1..0
..3..0..1..0..1..0....2..1..2..1..2..1....2..0..2..0..1..0....0..1..0..1..0..1
..0..3..0..1..0..1....1..2..1..2..1..2....0..2..0..2..0..1....3..0..1..0..1..2
CROSSREFS
Sequence in context: A045131 A365868 A056049 * A056087 A122692 A076760
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 06 2012
STATUS
approved

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Last modified May 19 23:42 EDT 2024. Contains 372703 sequences. (Running on oeis4.)