a puzzling sequence

[Ralf Stephan]

> Dear Seqfans,  can anyone explain this sequence?
> 
> %I A120310
> %S A120310 98,72,77,49,54,20,10,1,11,2,13,4,17,8,25,7,1,2,2,6,3,12,4,20,5,15,20,
> %T A120310 13,18,11,0,0,4,9,8,18,12,27

A concatenation of 4 sequences, each of which is two short sequences
intertwined using an unknown scheme. However, as the last sequence is
incomplete, the next few terms can be given as 16, 36, 20 (4n and 9n
intertwined).


ralf