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 A210782 Number of nX2 1..4 arrays with no element with value z exactly a city block distance of z from another element with value z 1
 15, 176, 1533, 8824, 40038, 167910, 710895, 3139374, 14621105, 73775740, 381369393, 1896558198, 8898865547, 40479815828, 186751218361, 891575695494, 4361545055817, 21344723416559, 102849312863141, 487830504402191 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A210788 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 EXAMPLE Some solutions for n=4 ..4..2....3..3....3..4....2..4....1..3....2..1....4..4....4..2....3..1....3..3 ..3..3....2..1....4..1....1..3....2..2....2..4....1..2....3..2....2..2....2..1 ..1..3....1..4....2..4....3..4....4..3....3..4....3..1....4..4....3..1....4..4 ..2..1....4..1....1..3....1..3....1..4....4..2....1..3....4..1....4..3....4..1 CROSSREFS Sequence in context: A184285 A120995 A024197 * A071535 A081043 A155000 Adjacent sequences: A210779 A210780 A210781 * A210783 A210784 A210785 KEYWORD nonn AUTHOR R. H. Hardin Mar 26 2012 STATUS approved

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Last modified October 3 20:04 EDT 2023. Contains 365870 sequences. (Running on oeis4.)