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A210261
Number of (n+1)X3 0..3 arrays containing all values 0..3 with every 2X2 subblock having three distinct values, and new values 0..3 introduced in row major order
1
29, 1039, 25901, 592969, 13233079, 292930403, 6467110597, 142651105201, 3145676312903, 69360351853819, 1529307333302941, 33718923388205609, 743448896978561935, 16391852782863165859, 361413860134081682837
OFFSET
1,1
COMMENTS
Column 2 of A210267
LINKS
FORMULA
Empirical: a(n) = 32*a(n-1) -225*a(n-2) +2856*a(n-4) -2952*a(n-5) -4100*a(n-6) +3664*a(n-7) -384*a(n-8)
EXAMPLE
Some solutions for n=4
..0..1..1....0..0..0....0..0..0....0..0..1....0..0..1....0..0..0....0..0..0
..2..0..2....1..2..3....1..2..1....2..1..2....1..2..0....1..2..1....1..2..3
..0..1..0....3..2..1....0..0..0....0..0..1....3..3..2....2..3..1....0..1..2
..3..3..3....1..1..3....1..2..1....1..2..1....0..1..2....1..3..2....1..3..1
..1..2..1....3..0..1....3..3..1....1..3..3....1..2..3....3..0..2....0..1..0
CROSSREFS
Sequence in context: A218635 A218239 A132058 * A138660 A237356 A176695
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 19 2012
STATUS
approved