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A081350
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First column in maze array of natural numbers A081349.
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6
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1, 2, 3, 4, 15, 16, 35, 36, 63, 64, 99, 100, 143, 144, 195, 196, 255, 256, 323, 324, 399, 400, 483, 484, 575, 576, 675, 676, 783, 784, 899, 900, 1023, 1024, 1155, 1156, 1295, 1296, 1443, 1444, 1599, 1600, 1763, 1764, 1935, 1936, 2115, 2116, 2303, 2304, 2499
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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a(0)=1, a(1)=2, a(n)=(n-1)*(n+(-1)^n), n>1.
G.f.: -(2*x^6-10*x^4+x^3+x^2-x-1)/((1-x)^3*(1+x)^2). [Colin Barker, Sep 03 2012]
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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