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 A199519 Number of nX4 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 0
 1, 105, 15400, 2491383, 425836476, 76066541392, 14045226977086, 2659503142845964, 513629992322483274, 100788315834577397826, 20037985877897676968942 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 4 of A199523 LINKS EXAMPLE Some solutions for n=3 ..0..1..2..3....0..1..2..3....0..0..1..2....0..1..1..2....0..1..2..0 ..0..0..1..2....0..3..2..2....3..2..0..3....0..3..2..2....3..3..1..3 ..2..3..1..3....1..1..0..3....1..3..1..2....3..0..3..1....2..0..1..2 CROSSREFS Sequence in context: A269474 A255497 A094075 * A082368 A001546 A111647 Adjacent sequences:  A199516 A199517 A199518 * A199520 A199521 A199522 KEYWORD nonn AUTHOR R. H. Hardin Nov 07 2011 STATUS approved

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Last modified January 26 18:26 EST 2022. Contains 350599 sequences. (Running on oeis4.)