The total T(d,n) of expressions with n instances of a digit d between 6 and 9 (and using the four arithmetic operators) which have a defined value when evaluated.
A243312
The total T(d,n) of expressions with n instances of a digit d between 6 and 9 (and using the four arithmetic operators) which have a defined value when evaluated.
Terms
- a(0) =1a(1) =4a(2) =31a(3) =305a(4) =3345a(5) =39505a(6) =487935a(7) =6245118
External references
- oeis: A243312