The number of subsets of positive integers of cardinality n, produced as the steps in a computation starting with 1 and using the operations of multiplication, addition, or subtraction.
A214872
The number of subsets of positive 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) =2a(2) =8a(3) =59a(4) =663a(5) =10609a(6) =225219a(7) =6057298a(8) =199290037a(9) =7805646133a(10) =356263294786
External references
- oeis: A214872