[seqfan] 2.a(n) = a(a(n))

[Eric Angelini]

Hello SeqFans,

Seq starts like this (I guess):
2,4,1,8,6,12,9,16,18,11,22,24,14,28,17,32,34,36,20,40,23,44,46,48,26,52,29,56,...
(always take the smallest a(n) not yet present and not leading to a contradiction)

Best,
E.