a(1)=1, a(2)=2, then use "merge and minus": a(n)=merge(a(n-2),a(n-1))-a(n-2)-a(n-1).
A075537
a(1)=1, a(2)=2, then use "merge and minus": a(n)=merge(a(n-2),a(n-1))-a(n-2)-a(n-1).
Terms
- a(0) =1a(1) =2a(2) =9a(3) =18a(4) =891a(5) =17982a(6) =89099109
External references
- oeis: A075537