Jacobsthal sequence (or Jacobsthal numbers): a(n) = a(n-1) + 2*a(n-2), with a(0) = 0, a(1) = 1; also a(n) = nearest integer to 2^n/3.
A001045
Jacobsthal sequence (or Jacobsthal numbers): a(n) = a(n-1) + 2*a(n-2), with a(0) = 0, a(1) = 1; also a(n) = nearest integer to 2^n/3.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =3a(4) =5a(5) =11a(6) =21a(7) =43a(8) =85a(9) =171a(10) =341a(11) =683a(12) =1365a(13) =2731a(14) =5461a(15) =10923a(16) =21845a(17) =43691a(18) =87381a(19) =174763a(20) =349525a(21) =699051a(22) =1398101a(23) =2796203a(24) =5592405a(25) =11184811a(26) =22369621a(27) =44739243a(28) =89478485a(29) =178956971
External references
- oeis: A001045