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 A197056 Number of nX3 0..4 arrays with each element equal to the number its horizontal and vertical neighbors equal to 2 1
 1, 3, 6, 10, 14, 22, 38, 67, 111, 179, 291, 485, 812, 1348, 2220, 3660, 6060, 10053, 16653, 27541, 45541, 75367, 124786, 206574, 341850, 565666, 936146, 1549447, 2564507, 4244263, 7024071, 11624777, 19239384, 31841864, 52698776, 87216664 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Every 0 is next to 0 2's, every 1 is next to 1 2's, every 2 is next to 2 2's, every 3 is next to 3 2's, every 4 is next to 4 2's Column 3 of A197061 LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 FORMULA Empirical: a(n) = a(n-1) +2*a(n-4) +a(n-5) +a(n-6) EXAMPLE Some solutions for n=4 ..2..2..2....1..2..2....0..0..0....0..1..1....2..2..1....0..0..0....1..1..1 ..2..3..2....1..2..2....1..1..0....1..2..2....2..2..1....0..1..1....2..2..2 ..2..3..2....0..1..1....2..2..1....1..2..2....1..1..0....1..2..2....2..4..2 ..2..2..2....0..0..0....2..2..1....0..1..1....0..0..0....1..2..2....2..2..2 CROSSREFS Sequence in context: A025206 A049989 A330258 * A104619 A194037 A194101 Adjacent sequences:  A197053 A197054 A197055 * A197057 A197058 A197059 KEYWORD nonn AUTHOR R. H. Hardin Oct 09 2011 STATUS approved

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Last modified January 24 00:05 EST 2022. Contains 350515 sequences. (Running on oeis4.)