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 A199518 Number of nX3 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, 45, 1260, 15400, 2513869, 174524175, 5866391058, 78538951349, 14918883751196, 1134907763429651, 40321453946092356, 558398606969183196, 113331120839472129952, 8998123036816556850222, 328615244611727182223731 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 3 of A199523 LINKS R. H. Hardin, Table of n, a(n) for n = 1..21 EXAMPLE Some solutions for n=3 ..0..0..1....0..0..1....0..1..1....0..1..1....0..1..0....0..1..0....0..1..2 ..2..2..3....2..1..2....2..3..0....2..3..3....1..2..3....2..1..2....3..0..3 ..2..1..3....3..0..3....3..2..2....2..0..2....2..0..3....3..3..2....1..2..2 CROSSREFS Sequence in context: A226981 A173000 A004350 * A075515 A330389 A243570 Adjacent sequences:  A199515 A199516 A199517 * A199519 A199520 A199521 KEYWORD nonn AUTHOR R. H. Hardin Nov 07 2011 STATUS approved

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Last modified August 14 01:00 EDT 2020. Contains 336473 sequences. (Running on oeis4.)