Digit echo forbidden

1) If the n-th digit of S is “d” (d chosen from 0,1,2,3,...9) then the (n+d+1)th digit of S cannot be “d”.

2) Start S with a(1)=1

3) Always extend S with the smallest available integer not yet present in S and not leading to a contradiction.

no “d” --> 2

no “d” --> 0 2 1 2 1 1 1 2 1 5 2

no “d” --> 1 2 3 4 5 16 07 18 9 2 03 3 22 1 4 13 2 15 42 1 62 6 7 1 2 87 1 39

S = 1,2,3,4,5,6,7,8,9,10,20,11,22,13,30,12,21,14,23,15,24,16,26,17,25,18,27,19,28,29,31,32,40,...

S is obviously finite (the term 9876543210 blocks any extension, for example); what is the last term of S?

Best,

É.