Number of positive integers with a shortest addition-subtraction chain of length n.
A383143
Number of positive integers with a shortest addition-subtraction chain of length n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =9a(6) =16a(7) =28a(8) =49a(9) =88a(10) =156a(11) =280a(12) =499a(13) =904a(14) =1639a(15) =2986a(16) =5442a(17) =9936a(18) =18134
External references
- oeis: A383143