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A275041
Number of 6Xn 0..2 arrays with no element equal to any value at offset (0,-1) (-1,-2) or (-2,0) and new values introduced in order 0..2.
1
24, 486, 1428, 9774, 64045, 421793, 2788663, 18527905, 123270618, 820404834, 5457383302, 36311630844, 241731826979, 1609452326761, 10715001495226, 71339194326992, 475007005017394, 3162779499787860, 21058326900918297
OFFSET
1,1
COMMENTS
Row 6 of A275037.
FORMULA
Empirical recurrence of order 67 (see link above)
EXAMPLE
Some solutions for n=4
..0..1..2..0. .0..1..0..1. .0..1..0..2. .0..1..0..2. .0..1..0..2
..2..0..1..2. .1..2..1..0. .1..2..1..2. .0..2..1..0. .0..1..2..0
..1..2..0..1. .1..0..2..0. .1..0..2..0. .1..0..2..0. .2..0..1..0
..0..1..0..1. .2..1..2..1. .2..0..2..1. .2..0..2..1. .1..2..0..2
..2..0..1..2. .0..2..1..2. .2..1..0..2. .0..2..0..1. .1..2..0..1
..1..0..1..2. .1..2..1..0. .1..2..1..0. .0..2..1..0. .2..0..2..1
CROSSREFS
Cf. A275037.
Sequence in context: A006548 A159877 A319426 * A109143 A260964 A186863
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 14 2016
STATUS
approved