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0, 1, 2, 2, 4, 4, 4, 4, 4, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 65, 65, 65, 65, 65, 65, 65, 65, 65, 65, 65, 65
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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COMMENTS
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LINKS
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MATHEMATICA
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a014137[n_] := Sum[CatalanNumber[k], {k, 0, n}];
a072643[n_] := Module[{i, c, a}, i = c = 0; a = 1; While[n > c, a *= (4*i + 2)/(i + 2); i++; c += a]; i];
a[n_] := a014137[a072643[n] - 1];
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PROG
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(Sage)
i = c = 0; a = 1
while n > c :
a *= (4*i+2)/(2+i)
i += 1; c += a
return c-a+1
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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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