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 A208171 Number of nX4 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors 1
 15, 2277, 473928, 99752346, 21002874867, 4422202024212, 931104734002155, 196046229442844736, 41277981610623482478, 8691173355900504027213, 1829946411015625966726620, 385299398603702723040648261 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A208175 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 226*a(n-1) -3345*a(n-2) +19752*a(n-3) -60897*a(n-4) +108504*a(n-5) -114399*a(n-6) +68040*a(n-7) -18225*a(n-8) for n>9 EXAMPLE Some solutions for n=4 ..0..0..0..1....0..1..0..0....0..0..0..1....0..0..0..0....0..0..1..0 ..1..1..0..0....2..0..3..0....0..1..1..0....0..1..1..2....2..0..1..2 ..2..3..3..0....2..0..3..1....0..1..2..3....1..0..1..3....1..3..0..0 ..0..2..1..3....1..2..0..2....3..0..3..1....1..3..3..1....1..3..2..2 CROSSREFS Sequence in context: A232196 A222881 A229844 * A266571 A308389 A278410 Adjacent sequences:  A208168 A208169 A208170 * A208172 A208173 A208174 KEYWORD nonn AUTHOR R. H. Hardin Feb 24 2012 STATUS approved

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Last modified January 22 19:39 EST 2020. Contains 331153 sequences. (Running on oeis4.)