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A054113
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T(2n,n), array T as in A054110.
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1
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1, 5, 17, 57, 197, 701, 2549, 9413, 35153, 132393, 501905, 1912769, 7321081, 28122281, 108355481, 418590521, 1620751301, 6287963741, 24438234341, 95128761941, 370821819581, 1447337568461, 5655535495901, 22122396951101
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: [ -1+4x+2*sqrt(1-4x)]/[(1-x)(1-4x)]. - Ralf Stephan, Apr 03 2004
a(n) = 4s(n)+1, with s(n) = A079309(n) = sum(k=1, n, C(2k+1, k+1)). - Ralf Stephan, Apr 03 2004
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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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