The number of subsets of integers of cardinality n, produced as the steps in a computation starting with 1 and using the operations of multiplication, addition, or subtraction.
A229662
The number of subsets of 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) =2a(1) =5a(2) =20a(3) =149a(4) =1852a(5) =34354a(6) =873386a(7) =28671789a(8) =1166062774a(9) =56973937168
External references
- oeis: A229662