[seqfan] a(n)+a(n+1) = concatenation of n and (n+1)

[Eric Angelini]

> 
> Hello SeqFans,
> start with a(1) = 1 then :
> n = 1....2....3....4....5....6....7....8....9....10...11...12...13...14
> S =
> 1,11,12,22,23,33,34,44,45,865,...
> 
> Ex:
> 1+11=12 which is 1 conc. 2
> 11+12=23 which is 2 conc. 3
> 12+22=34 which is 3 conc. 4
> 22+23=45 which is 4 con. 5
> etc.
> The leftmost column is S.
> Best,
> É.
> 
>