Number of integers obtainable from 1 in n steps using addition, multiplication, and subtraction.
A216999
Number of integers obtainable from 1 in n steps using addition, multiplication, and subtraction.
Terms
- a(0) =1a(1) =3a(2) =6a(3) =13a(4) =38a(5) =153a(6) =867a(7) =6930a(8) =75986a(9) =1109442a(10) =20693262a(11) =477815647
External references
- oeis: A216999