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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

%I

%S 5,52,496,7536,224792,13949968,1780090736,465161983824,

%T 246624000644912,263286800959827832,563752320057171922352,

%U 2417354884909931307656688,20747077497647444504550311672

%N 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

%e Some solutions for 4X4

%e ..1..2..2..1....3..4..1..4....3..2..4..4....1..4..3..3....3..2..3..2

%e ..2..2..1..2....4..3..4..3....2..3..2..4....4..3..4..3....2..3..3..2

%e ..2..1..2..2....1..4..3..3....4..2..3..2....3..4..3..3....3..3..2..3

%e ..1..2..2..2....4..3..3..2....4..4..2..3....3..3..3..3....2..2..3..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Aug 05 2011

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Last modified May 17 12:43 EDT 2021. Contains 343971 sequences. (Running on oeis4.)