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A022939 Unique increasing sequence satisfying a(n) = a(n-2) + c(n-2); where c( ) is complement of a( ). 2
1, 2, 4, 7, 10, 15, 19, 26, 31, 39, 45, 55, 62, 73, 82, 94, 104, 117, 128, 142, 155, 170, 184, 200, 216, 233, 250, 268, 286, 305, 324, 345, 365, 387, 408, 431, 454, 478, 502, 527, 552, 578, 604, 631, 658, 687, 715, 745, 774, 805, 835, 868, 899 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Ivan Neretin, Table of n, a(n) for n = 1..10000

MATHEMATICA

Fold[Append[#1, #1[[#2]] + Complement[Range[Max@#1 + 1], #1][[#2]]] &, {1, 2}, Range[50]] (* Ivan Neretin, Apr 04 2016 *)

CROSSREFS

Cf. A005228 and references therein.

Sequence in context: A276164 A095116 A027384 * A036702 A007983 A049640

Adjacent sequences:  A022936 A022937 A022938 * A022940 A022941 A022942

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified May 24 22:11 EDT 2017. Contains 287008 sequences.