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A022432
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a(n) = c(n-1) + c(n-3) where c is the sequence of numbers not in a.
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1
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1, 3, 4, 8, 12, 15, 17, 20, 23, 25, 29, 32, 35, 39, 41, 45, 48, 51, 54, 57, 59, 63, 65, 69, 71, 74, 77, 80, 83, 86, 89, 91, 95, 97, 101, 103, 107, 109, 113, 116, 119, 122, 125, 128, 131, 134
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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Fold[Append[#1, Plus @@ Complement[Range[Max@#1 + 3], #1][[{#2, #2 + 2}]]] &, {1, 3, 4}, Range[43]] (* Ivan Neretin, Mar 29 2017 *)
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CROSSREFS
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Cf. A022424 and references therein.
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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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