a(1)=1, a(2)=2, then use "merge and minus": a(n)=merge(a(1),...,a(n-1))-a(1)-...-a(n-1).
A075538
a(1)=1, a(2)=2, then use "merge and minus": a(n)=merge(a(1),...,a(n-1))-a(1)-...-a(n-1).
Terms
- a(0) =1a(1) =2a(2) =9a(3) =117a(4) =128988a(5) =129116999871
External references
- oeis: A075538