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 A209366 Number of n X n 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z 0
 3, 39, 115, 968, 19434, 677448, 43249360, 5008603698, 1040887695040, 390290619582728, 263701318486632444, 321337793316358945352, 705783458367197689313992 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A209374 LINKS EXAMPLE Some solutions for n=5 ..3..1..2..1..3....2..2..3..1..2....2..2..3..1..3....1..3..1..2..2 ..1..3..1..3..2....1..3..1..3..2....1..3..1..3..1....2..1..3..1..3 ..2..2..3..1..3....3..1..2..1..3....3..1..2..2..3....2..3..1..3..1 ..1..3..1..2..1....1..3..1..3..1....1..3..1..3..1....3..1..3..1..3 ..3..1..3..2..3....2..2..3..1..2....3..1..3..1..3....1..2..2..3..1 CROSSREFS Sequence in context: A134106 A153875 A082954 * A292542 A212664 A050392 Adjacent sequences:  A209363 A209364 A209365 * A209367 A209368 A209369 KEYWORD nonn AUTHOR R. H. Hardin Mar 07 2012 STATUS approved

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Last modified October 22 22:22 EDT 2020. Contains 337962 sequences. (Running on oeis4.)