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1/24 the number of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock containing exactly three distinct values.

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`%I #7 Sep 08 2022 13:08:09
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`%S 6,1243,1427084,9207834547,332948364816764,67504953898839080670
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`%N 1/24 the number of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock containing exactly three distinct values.
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`%C Diagonal of A183594.
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`%e Some solutions with a(1,1)=0 for 3 X 3
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`%e ..0..1..0....0..2..3....0..2..2....0..1..0....0..1..2....0..2..0....0..3..1
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`%e ..0..2..1....1..2..1....3..0..3....1..2..1....2..0..0....2..3..3....1..1..0
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`%e ..3..3..3....0..0..2....2..2..0....0..2..3....0..3..2....1..1..2....0..3..1
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`%Y Cf. A183594.
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`%K nonn
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`%O 1,1
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`%A _R. H. Hardin_, Jan 05 2011
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