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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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A208201 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 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 Adjacent sequences:  A208194 A208195 A208196 * A208198 A208199 A208200 KEYWORD nonn AUTHOR R. H. Hardin Feb 24 2012 STATUS approved

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Last modified June 28 17:31 EDT 2022. Contains 354907 sequences. (Running on oeis4.)