The trisection A178242(3n+2).

Terms

a(0) =7a(1) =25a(2) =26a(3) =44a(4) =133a(5) =187a(6) =125a(7) =161a(8) =403a(9) =493a(10) =296a(11) =350a(12) =817a(13) =943a(14) =539a(15) =611a(16) =1375a(17) =1537a(18) =854a(19) =944a(20) =2077a(21) =2275a(22) =1241a(23) =1349a(24) =2923a(25) =3157a(26) =1700a(27) =1826a(28) =3913a(29) =4183