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A120145
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a(n) = 20 + floor( (1 + Sum_{j=1..n-1} a(j)) / 2 ).
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2
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20, 30, 45, 68, 102, 153, 229, 344, 516, 774, 1161, 1741, 2612, 3918, 5877, 8815, 13223, 19834, 29751, 44627, 66940, 100410, 150615, 225923, 338884, 508326, 762489, 1143734, 1715601, 2573401, 3860102, 5790153, 8685229, 13027844
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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a[n_]:= a[n]= 20 +Quotient[1 +Sum[a[k], {k, n-1}], 2];
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PROG
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(SageMath)
@CachedFunction
def A120145(n): return 20 + (1+sum(A120145(k) for k in range(1, n)))//2
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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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