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A224156
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Number of nX6 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing
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1
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22, 169, 702, 2271, 6786, 20065, 60214, 184233, 575410, 1833641, 5947567, 19579806, 65205152, 219009930, 740080588, 2511332286, 8545644419, 29133026750, 99436525669, 339656225391, 1160767044395, 3968114261421, 13567722769117
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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) -14*a(n-2) +3*a(n-3) +7*a(n-4) +24*a(n-5) -58*a(n-6) +62*a(n-7) -67*a(n-8) +112*a(n-9) -164*a(n-10) +193*a(n-11) -92*a(n-12) -46*a(n-13) +22*a(n-14) -60*a(n-15) -144*a(n-16) +42*a(n-17) -254*a(n-18) -28*a(n-19) -120*a(n-20) -72*a(n-21) +36*a(n-22) -4*a(n-23) +12*a(n-24) for n>27
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EXAMPLE
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Some solutions for n=3
..0..0..0..1..1..0....0..0..0..0..0..0....1..0..0..0..0..0....0..0..0..1..0..0
..0..0..1..1..1..0....0..0..1..1..1..1....0..0..0..0..0..0....1..1..1..1..0..0
..0..1..1..1..0..0....1..1..1..1..1..1....0..0..0..0..1..0....1..1..1..0..0..0
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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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