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A208197
Number of nX4 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors
1
15, 2653, 639701, 156617480, 38372808893, 9402035642924, 2303673397508915, 564442821781056268, 138298988287411669755, 33885824084409470445384, 8302657077306720410135797, 2034305388933816797435987804
OFFSET
1,1
COMMENTS
Column 4 of A208201
LINKS
FORMULA
Empirical: a(n) = 236*a(n-1) +2368*a(n-2) -37526*a(n-3) -310734*a(n-4) +811712*a(n-5) +1791667*a(n-6) -2516274*a(n-7) -1895184*a(n-8) +2138400*a(n-9) -373248*a(n-10) for n>11
EXAMPLE
Some solutions for n=4
..0..0..0..1....0..0..0..1....0..1..1..0....0..0..0..1....0..0..0..0
..0..1..1..0....1..1..0..0....0..0..2..0....0..1..0..2....0..1..1..2
..0..1..2..3....2..3..3..0....0..2..1..1....2..1..0..3....1..0..1..3
..3..0..3..1....0..2..1..3....3..1..0..0....1..0..1..0....1..3..3..1
CROSSREFS
Sequence in context: A241116 A126678 A340185 * A232407 A208404 A208411
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 24 2012
STATUS
approved