Length of shortest (or optimal) Golomb ruler with n marks.

Terms

a(0) =1a(1) =3a(2) =6a(3) =11a(4) =17a(5) =25a(6) =34a(7) =44a(8) =55a(9) =72a(10) =85a(11) =106a(12) =127a(13) =151a(14) =177a(15) =199a(16) =216a(17) =246a(18) =283a(19) =333a(20) =356a(21) =372a(22) =425a(23) =480a(24) =492a(25) =553a(26) =585