A grasshopper sequence: closed under n -> 2n+2 and 6n+6.

Terms

a(0) =1a(1) =4a(2) =10a(3) =12a(4) =22a(5) =26a(6) =30a(7) =46a(8) =54a(9) =62a(10) =66a(11) =78a(12) =94a(13) =110a(14) =126a(15) =134a(16) =138a(17) =158a(18) =162a(19) =186a(20) =190a(21) =222a(22) =254a(23) =270a(24) =278a(25) =282a(26) =318a(27) =326a(28) =330a(29) =374