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A156376
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a(n) = 30*n + 19.
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2
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19, 49, 79, 109, 139, 169, 199, 229, 259, 289, 319, 349, 379, 409, 439, 469, 499, 529, 559, 589, 619, 649, 679, 709, 739, 769, 799, 829, 859, 889, 919, 949, 979, 1009, 1039, 1069, 1099, 1129, 1159, 1189, 1219, 1249, 1279, 1309, 1339, 1369, 1399, 1429, 1459
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = 2*a(n-1) - a(n-2).
G.f.: (19+11*x)/(x-1)^2.
Sum_{n>=0} a(n)/(16*(n+1)^3*(2n+1)*binomial(2n+1,n)^2) = zeta(3). - Daniel Suteu, Oct 31 2017
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MATHEMATICA
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PROG
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(Magma) I:=[19, 49]; [n le 2 select I[n] else 2*Self(n-1)-Self(n-2): n in [1..50]]; // Vincenzo Librandi, Mar 01 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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EXTENSIONS
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STATUS
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approved
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