A286043 - OEIS

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A286043

(1/2)*A285658.

1, 4, 6, 8, 10, 12, 15, 17, 19, 22, 24, 26, 29, 31, 33, 36, 38, 40, 43, 45, 47, 49, 51, 54, 56, 58, 61, 63, 65, 68, 70, 72, 74, 76, 79, 81, 83, 86, 88, 90, 93, 95, 97, 99, 101, 104, 106, 108, 111, 113, 115, 118, 120, 122, 124, 126, 129, 131, 133, 136, 138

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Conjecture: a(n)/n -> (5 + sqrt(17))/2.

LINKS

Georg Fischer, Table of n, a(n) for n = 1..10000 [First 8730 terms from Clark Kimberling]

MATHEMATICA

s = Nest[Flatten[# /. {0 -> {1, 1}, 1 -> {1, 0, 1, 1}}] &, {0}, 10] (* A285657 *)

u = Flatten[Position[s, 0]] (* A285658 *)

u/2 (* A286043 *)

CROSSREFS