Numbers of form |2^i +- 3^j|.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =7a(7) =8a(8) =9a(9) =10a(10) =11a(11) =13a(12) =15a(13) =17a(14) =19a(15) =23a(16) =25a(17) =26a(18) =28a(19) =29a(20) =31a(21) =33a(22) =35a(23) =37a(24) =41a(25) =43a(26) =47a(27) =49a(28) =55a(29) =59