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A253695
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Number of (n+1)X(5+1) 0..1 arrays with every 2X2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically
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1
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680, 540, 618, 992, 1632, 2386, 4180, 6552, 10696, 18236, 28352, 47594, 80548, 128248, 216740, 356714, 584026, 981652, 1609356, 2663806, 4459244, 7313942, 12171062, 20237510, 33418882, 55628622, 92193244, 152691570, 254244632
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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) = 2*a(n-2) +2*a(n-3) +4*a(n-4) +2*a(n-5) -7*a(n-6) -17*a(n-7) -7*a(n-8) -8*a(n-9) -10*a(n-10) +38*a(n-11) +42*a(n-12) +3*a(n-13) +28*a(n-14) +a(n-15) -60*a(n-16) -17*a(n-17) -16*a(n-18) -40*a(n-19) +14*a(n-20) +20*a(n-21) -a(n-22) +16*a(n-23) +8*a(n-24) +4*a(n-26) for n>31
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EXAMPLE
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Some solutions for n=4
..1..0..0..1..0..0....1..0..0..0..0..1....0..1..0..1..1..0....0..0..0..1..0..1
..0..1..0..0..1..1....0..1..0..1..0..0....1..1..0..1..1..0....0..1..1..1..0..1
..0..0..1..1..0..1....0..1..0..0..1..1....0..1..1..0..0..1....1..0..1..1..1..0
..1..1..0..1..1..0....0..0..1..1..0..1....1..0..0..1..0..1....0..0..1..0..0..1
..0..1..1..0..0..0....1..1..0..1..0..0....0..1..0..1..1..0....0..0..0..1..0..1
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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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