A self-descriptive sequence: positions of consonants in "zero, two, four, ...".

Terms

a(0) =0a(1) =2a(2) =4a(3) =5a(4) =7a(5) =10a(6) =11a(7) =13a(8) =15a(9) =17a(10) =19a(11) =20a(12) =22a(13) =24a(14) =26a(15) =28a(16) =29a(17) =30a(18) =32a(19) =33a(20) =36a(21) =37a(22) =39a(23) =40a(24) =43a(25) =44a(26) =46a(27) =48a(28) =49a(29) =52