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 A199516 Number of nX1 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to two or fewer horizontal or vertical neighbors 1
 1, 1, 1, 1, 10, 45, 105, 105, 1260, 6300, 15400, 15400, 200200, 1051050, 2627625, 2627625, 35735700, 192972780, 488864376, 488864376, 6844101264, 37642556952, 96197645544, 96197645544, 1374252079200, 7656547298400, 19688264481600 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Column 1 of A199523 LINKS R. H. Hardin, Table of n, a(n) for n = 1..174 EXAMPLE Some solutions for n=6 ..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0 ..1....1....1....1....1....1....1....1....1....1....1....1....1....0....1....1 ..2....0....2....2....2....1....2....2....2....1....0....0....0....1....2....2 ..1....2....0....2....3....2....0....3....3....2....2....1....2....2....3....2 ..2....1....3....3....2....3....2....1....1....3....3....2....2....3....2....3 ..3....3....1....1....0....2....3....3....0....0....1....3....3....2....1....0 CROSSREFS Sequence in context: A275623 A245871 A199350 * A001488 A009540 A010926 Adjacent sequences:  A199513 A199514 A199515 * A199517 A199518 A199519 KEYWORD nonn AUTHOR R. H. Hardin Nov 07 2011 STATUS approved

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Last modified April 23 14:15 EDT 2019. Contains 322386 sequences. (Running on oeis4.)