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A204956
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Number of (n+1)X3 0..1 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing
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1
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51, 277, 1436, 6921, 32468, 147434, 659392, 2907273, 12720102, 55312482, 239664411, 1035761616, 4469289143, 19264431459, 82983495781, 357308047528, 1538085137733, 6619812032809, 28488295966068, 122591240597807
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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) = 7*a(n-1) +6*a(n-2) -121*a(n-3) +60*a(n-4) +899*a(n-5) -794*a(n-6) -3741*a(n-7) +3822*a(n-8) +9513*a(n-9) -10198*a(n-10) -15151*a(n-11) +16736*a(n-12) +14873*a(n-13) -17358*a(n-14) -8327*a(n-15) +11131*a(n-16) +1988*a(n-17) -4040*a(n-18) +204*a(n-19) +636*a(n-20) -144*a(n-21)
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EXAMPLE
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Some solutions for n=4
..1..1..1....0..0..1....1..0..0....1..1..1....0..0..0....1..0..0....0..1..0
..0..1..0....0..0..0....0..0..1....1..1..1....1..0..1....1..0..1....0..0..1
..1..0..1....1..0..1....1..0..1....1..1..1....0..0..0....1..0..1....1..1..1
..1..1..1....1..0..0....0..1..1....1..1..1....0..1..1....1..0..1....0..1..0
..1..0..1....1..0..0....1..1..1....1..1..1....0..1..0....0..0..1....1..1..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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