OFFSET
1,2
COMMENTS
See A191203.
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10000
EXAMPLE
1 -> 2,3 -> 4,6 -> 8,9,12 ->
MATHEMATICA
g=16; Union[Flatten[NestList[{Floor[3 #/2], 2#} &, 1, g]]]
(* A191284; use g>15 to get all of first 60 terms *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, May 29 2011
STATUS
approved