Number of distinct integers that can be generated by an expression containing n binary operators (any of add, subtract, multiply and divide) whose operands are any integer between 1 and 9; parenthesis allowed.
A181959
Number of distinct integers that can be generated by an expression containing n binary operators (any of add, subtract, multiply and divide) whose operands are any integer between 1 and 9; parenthesis allowed.
Terms
- a(0) =9a(1) =48a(2) =236a(3) =1274a(4) =6489a(5) =30229a(6) =142320a(7) =711955a(8) =3601566
External references
- oeis: A181959