Number of inequivalent expressions involving n operands.
A140606
Number of inequivalent expressions involving n operands.
Terms
- a(0) =1a(1) =6a(2) =68a(3) =1170a(4) =27142a(5) =793002a(6) =27914126a(7) =1150212810a(8) =54326011414
External references
- oeis: A140606