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 A210780 Number of n X n 1..4 arrays with no element with value z exactly a city block distance of z from another element with value z 0
 4, 176, 21379, 1115472, 98861559, 51104966068 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A210788 LINKS Table of n, a(n) for n=1..6. EXAMPLE Some solutions for n=4 ..4..4..1..2....2..4..1..2....3..1..4..4....2..1..3..1....2..1..3..3 ..4..4..4..3....1..3..3..3....1..2..2..1....1..4..2..3....2..4..3..2 ..2..1..3..1....4..2..3..1....3..1..3..4....3..1..2..4....4..1..4..2 ..2..3..1..2....1..4..1..2....1..3..1..2....2..4..4..3....1..4..4..1 CROSSREFS Sequence in context: A251695 A343610 A113254 * A127606 A041945 A300387 Adjacent sequences: A210777 A210778 A210779 * A210781 A210782 A210783 KEYWORD nonn AUTHOR R. H. Hardin Mar 26 2012 STATUS approved

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Last modified September 22 15:11 EDT 2023. Contains 365531 sequences. (Running on oeis4.)