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A231052
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Number of 4Xn 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero
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1
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0, 10, 410, 2080, 20050, 310804, 4110640, 50618998, 638796662, 8156441186, 103727443616, 1316635701154, 16723288145932, 212476379058152, 2699313938169806, 34290564462889370, 435615577448735910
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 10*a(n-1) +26*a(n-2) +92*a(n-3) +616*a(n-4) -4329*a(n-5) -16937*a(n-6) +9747*a(n-7) +74627*a(n-8) +138730*a(n-9) +199463*a(n-10) -165251*a(n-11) -709116*a(n-12) -1160893*a(n-13) -2172906*a(n-14) -2451394*a(n-15) -1288052*a(n-16) +2653888*a(n-17) +4205208*a(n-18) +4581464*a(n-19) +2645760*a(n-20) -2865936*a(n-21) -4590592*a(n-22) -1547392*a(n-23) +1079872*a(n-24) +722560*a(n-25) +97536*a(n-26) +29696*a(n-27) +37888*a(n-28) +6144*a(n-29) -4096*a(n-30) -16384*a(n-31) for n>32
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EXAMPLE
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Some solutions for n=4
..0..3..2..1....0..1..2..3....0..3..2..1....0..3..0..3....0..1..0..3
..0..1..0..1....0..3..0..3....0..1..0..3....0..1..2..1....2..3..2..3
..0..1..0..3....1..2..1..2....2..1..0..3....0..3..2..3....2..1..0..3
..0..3..2..1....1..0..3..2....0..3..2..1....0..1..0..1....2..3..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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