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 A193809 Number of n X n symmetric 0..4 arrays with no element equal to the difference mod 5 of any two of its horizontal and vertical neighbors 0
 5, 52, 496, 7536, 224792, 13949968, 1780090736, 465161983824, 246624000644912, 263286800959827832, 563752320057171922352, 2417354884909931307656688, 20747077497647444504550311672 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE Some solutions for 4X4 ..1..2..2..1....3..4..1..4....3..2..4..4....1..4..3..3....3..2..3..2 ..2..2..1..2....4..3..4..3....2..3..2..4....4..3..4..3....2..3..3..2 ..2..1..2..2....1..4..3..3....4..2..3..2....3..4..3..3....3..3..2..3 ..1..2..2..2....4..3..3..2....4..4..2..3....3..3..3..3....2..2..3..1 CROSSREFS Sequence in context: A081075 A247766 A247777 * A134111 A071583 A099881 Adjacent sequences:  A193806 A193807 A193808 * A193810 A193811 A193812 KEYWORD nonn AUTHOR R. H. Hardin Aug 05 2011 STATUS approved

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Last modified April 19 17:46 EDT 2021. Contains 343117 sequences. (Running on oeis4.)