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A210178
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Number of (n+1)X4 0..3 arrays containing all values 0..3 with every 2X2 subblock having three or four distinct values, and new values 0..3 introduced in row major order
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1
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744, 79017, 7363642, 677791782, 62264517380, 5718695139568, 525217898009080, 48237037195753208, 4430181416208443992, 406876280707186239248, 37368290569123715949088, 3431974791829880915134368
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 93*a(n-1) +199*a(n-2) -28711*a(n-3) +35176*a(n-4) +2453690*a(n-5) -5602318*a(n-6) -51561340*a(n-7) +96505796*a(n-8) +378763976*a(n-9) -653899024*a(n-10) -988302720*a(n-11) +1830649984*a(n-12) +381532160*a(n-13) -1548998656*a(n-14) +621346816*a(n-15) -44040192*a(n-16)
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EXAMPLE
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Some solutions for n=4
..0..0..0..1....0..1..2..1....0..0..1..0....0..0..1..0....0..0..0..1
..1..2..1..2....2..3..0..1....1..2..3..1....2..1..2..2....1..2..1..2
..2..3..1..0....2..0..1..2....1..3..0..1....1..3..0..3....2..0..1..3
..0..3..0..2....3..0..2..0....0..0..1..2....0..3..1..0....1..3..0..0
..1..1..1..3....3..1..2..1....3..1..2..3....2..1..2..0....1..0..2..3
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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