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A319924
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a(n) = A143565(2n,n) for n > 0, a(0) = 1.
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2
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1, 3, 13, 61, 281, 1261, 5545, 24025, 102961, 437581, 1847561, 7759753, 32449873, 135207801, 561632401, 2326762801, 9617286241, 39671305741, 163352435401, 671560012201, 2756930576401, 11303415363241, 46290177201841, 189368906734801, 773942488394401
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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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a(n) = A143565(2n,n) for n > 0, a(0) = 1.
a(n) = 1 + 2 * A002457(n-1) = 1 + 2 * (2*n-1)!/(n-1)!^2 for n > 0, a(0) = 1.
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MAPLE
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a:= proc(n) option remember; `if`(n<2, 2*n+1,
((15*n^2-29*n+10)*a(n-1)-(6*n-2)*(2*n-3)*
a(n-2))/((n-1)*(3*n-4)))
end:
seq(a(n), n=0..30);
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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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