A026215 a(n) is the position of n in A026214.

2, 1, 6, 8, 3, 4, 14, 5, 18, 20, 7, 24, 26, 9, 10, 32, 11, 12, 38, 13, 42, 44, 15, 16, 50, 17, 54, 56, 19, 60, 62, 21, 22, 68, 23, 72, 74, 25, 78, 80, 27, 28, 86, 29, 30, 92, 31, 96, 98, 33, 34, 104, 35, 36, 110, 37, 114, 116, 39, 40, 122, 41

Offset

1,1

Links

Michael De Vlieger, Table of n, a(n) for n = 1..10922

F. M. Dekking, Permutations of N generated by left-right filling algorithms, arXiv:2001.08915 [math.CO], 2020.

Mathematica

With[{s = Array[If[Mod[#/3^IntegerExponent[#, 3], 3] == 1, Ceiling[#/3], #] &[(6 # + 1)/4 - (-1)^#/4] &, Floor[2 #/3]] &[189]}, Array[FirstPosition[s, #][[1]] &, LengthWhile[Differences@ Union[s], # == 1 &]]] (* Michael De Vlieger, Aug 29 2021 *)

Crossrefs

Cf. A026214.

Sequence in context: A220884 A217877 A138510 * A026220 A138750 A342369

Adjacent sequences: A026212 A026213 A026214 * A026216 A026217 A026218

Keyword

nonn

Author

Clark Kimberling

Status

approved