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A022432 a(n) = c(n-1) + c(n-3) where c is the sequence of numbers not in a. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Ivan Neretin, Table of n, a(n) for n = 0..10000

MATHEMATICA

Fold[Append[#1, Plus @@ Complement[Range[Max@#1 + 3], #1][[{#2, #2 + 2}]]] &, {1, 3, 4}, Range[43]] (* Ivan Neretin, Mar 29 2017 *)

CROSSREFS

Cf. A022424 and references therein.

Sequence in context: A080646 A187579 A050102 * A271474 A120116 A199880

Adjacent sequences:  A022429 A022430 A022431 * A022433 A022434 A022435

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified December 5 03:31 EST 2020. Contains 338943 sequences. (Running on oeis4.)