OFFSET
1,2
COMMENTS
a(n) = a(n-1) + c(n) for n >= 2, a( ) increasing, given a(1) = 1; where c( ) is complement of a( ). - Clark Kimberling
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10000
G. S. Kazandzidis, A General Formula for Some Number-Sequences, Math. Annalen, 147 (1962), 367-372.
MATHEMATICA
Fold[Append[#1, #1[[-1]] + Complement[Range[Max@#1 + 3], #1][[#2]]] &, {1, 4}, Range[3, 50]] (* Ivan Neretin, Apr 05 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved