The number of subsets of nonzero integers of cardinality n, produced as the steps in a computation starting with 1 and using the operations of multiplication, addition, or subtraction.
A229673
The number of subsets of nonzero integers of cardinality n, produced as the steps in a computation starting with 1 and using the operations of multiplication, addition, or subtraction.
Terms
- a(0) =1a(1) =3a(2) =15a(3) =126a(4) =1667a(5) =31966a(6) =828678a(7) =27535826a(8) =1128945382a(9) =55473589278
External references
- oeis: A229673