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A284885 (A284883)/2. 4
2, 3, 5, 6, 7, 8, 11, 12, 14, 15, 16, 17, 20, 21, 22, 23, 26, 27, 29, 30, 32, 33, 34, 35, 38, 39, 41, 42, 43, 44, 47, 48, 49, 50, 53, 54, 56, 57, 59, 60, 61, 62, 65, 66, 67, 68, 71, 72, 74, 75, 77, 78, 79, 80, 83, 84, 86, 87, 88, 89, 92, 93, 95, 96, 97, 98 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000

MATHEMATICA

s = Nest[Flatten[# /. {0 -> {0, 1}, 1 -> {0, 1, 1, 0}}] &, {0}, 6] (* A284878 *)

d = Differences[s]  (* A284881 *)

d2 = Flatten[Position[d, 0]]  (* A284883 *)

d2/2  (* A284885 *)

CROSSREFS

Cf. A284878, A284881, A284883.

Sequence in context: A224517 A080220 A028778 * A094180 A116545 A140661

Adjacent sequences:  A284882 A284883 A284884 * A284886 A284887 A284888

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Apr 16 2017

STATUS

approved

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Last modified October 22 00:52 EDT 2019. Contains 328315 sequences. (Running on oeis4.)