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 A199351 Number of nX2 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 zero or one horizontal or vertical neighbors 1
 1, 1, 45, 105, 4251, 9175, 447916, 958259, 50233308, 106354160, 5897448012, 12409253763, 715649665145, 1498983975673, 89063549460702, 185913744482294, 11306002322078532, 23537550026903929, 1458334886366979145 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Column 2 of A199356 LINKS R. H. Hardin, Table of n, a(n) for n = 1..40 EXAMPLE Some solutions for n=4 ..0..1....0..1....0..0....0..1....0..1....0..1....0..1....0..1....0..1....0..1 ..1..2....2..3....1..2....2..2....2..0....2..0....2..1....2..3....0..2....2..3 ..3..3....1..0....2..3....1..3....3..2....2..3....3..3....3..0....2..1....3..2 ..2..0....2..3....3..1....0..3....3..1....1..3....0..2....2..1....3..3....1..0 CROSSREFS Sequence in context: A331190 A332593 A144486 * A199517 A180971 A043442 Adjacent sequences:  A199348 A199349 A199350 * A199352 A199353 A199354 KEYWORD nonn AUTHOR R. H. Hardin Nov 05 2011 STATUS approved

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Last modified November 30 22:59 EST 2021. Contains 349426 sequences. (Running on oeis4.)