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A193809
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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
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0
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5, 52, 496, 7536, 224792, 13949968, 1780090736, 465161983824, 246624000644912, 263286800959827832, 563752320057171922352, 2417354884909931307656688, 20747077497647444504550311672
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