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A050026
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a(n) = a(n-1) + a(m) for n >= 4, where m = n - 1 - 2^p and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = a(3) = 1.
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4
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1, 1, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 13, 16, 20, 25, 31, 32, 33, 34, 36, 39, 43, 48, 54, 62, 71, 81, 92, 105, 121, 141, 166, 167, 168, 169, 171, 174, 178, 183, 189, 197, 206, 216, 227, 240, 256, 276, 301
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OFFSET
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1,4
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LINKS
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MATHEMATICA
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Fold[Append[#1, #1[[-1]] + #1[[#2]]] &, {1, 1, 1}, Flatten@Table[k, {n, 5}, {k, 2^n}]] (* Ivan Neretin, Aug 30 2015 *)
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PROG
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(PARI) lista(nn) = {nn = max(nn, 3); my(va = vector(nn)); va[1] = 1; va[2] = 1; va[3] = 1; for(n=4, nn, va[n] = va[n-1] + va[n - 1 - 2^logint(n-2, 2)]); va; } \\ Petros Hadjicostas, May 03 2020
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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