OFFSET
1,2
COMMENTS
See A191203.
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10000
EXAMPLE
1 -> 2 -> 3,4 -> 6,8,10 ->
MATHEMATICA
g = 12; Union[Flatten[NestList[{2 #, (#^2 + #)/2} &, 1, g]]]
(* A191283; use g>10 to get all of first 60 terms *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, May 29 2011
STATUS
approved