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 A199090 Number of 2nX4 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 exactly one horizontal or vertical neighbor 0
 5, 420, 44837, 5471810, 726413391, 101787127746, 14800090575471, 2211229549716802, 337343474770282699, 52327061345761775192 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Even terms of column 4 of A199092 LINKS EXAMPLE Some solutions for 4X4 ..0..1..2..3....0..1..2..2....0..1..2..0....0..0..1..0....0..1..2..2 ..0..1..2..3....0..1..0..0....0..1..2..0....2..3..1..0....0..1..0..0 ..3..3..0..1....2..2..3..3....3..3..1..1....2..3..2..2....3..2..1..3 ..2..2..0..1....3..3..1..1....2..2..3..3....1..1..3..3....3..2..1..3 CROSSREFS Sequence in context: A218406 A217939 A147684 * A218393 A038003 A054332 Adjacent sequences:  A199087 A199088 A199089 * A199091 A199092 A199093 KEYWORD nonn AUTHOR R. H. Hardin Nov 02 2011 STATUS approved

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Last modified June 26 10:01 EDT 2022. Contains 354879 sequences. (Running on oeis4.)