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A120144
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a(n) = 19 + floor( Sum_{j=1..n-1} a(j) / 2 ).
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3
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19, 28, 42, 63, 95, 142, 213, 320, 480, 720, 1080, 1620, 2430, 3645, 5467, 8201, 12301, 18452, 27678, 41517, 62275, 93413, 140119, 210179, 315268, 472902, 709353, 1064030, 1596045, 2394067, 3591101, 5386651, 8079977, 12119965, 18179948
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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]= 19 +Quotient[Sum[a[k], {k, n-1}], 2];
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PROG
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(SageMath)
@CachedFunction
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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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