Sequence builder 3n+1 from odd to odd

Current n: 1 (dec) 1 (bin) mod 8 = 1

Action Select New odd number (dec) New odd number (bin) New odd number mod 8 Movement
n * 4 + 1 5 (Alias for 1) 101 5 Up  
n + (n-1)/3 1 1 1 Up  
n - (n+1)/3 (not possible)       Down
Submit    

Sequence: UDDU1
Parity sequence: UDU1

Sequence executed:

Iteration Decimal Binary n mod 8 n mod 4
1. 1 1 1 1 - Up
2. 4 100 1 0 - Down
3. 2 10 2 2 - Down
4. 1 1 1 1 - Up