Terms in A015922 not divisible by 3.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =248a(5) =731a(6) =1333a(7) =3503a(8) =17608a(9) =35003a(10) =50963a(11) =62611a(12) =82603a(13) =90148a(14) =94643a(15) =106978a(16) =201295a(17) =231311a(18) =253828a(19) =335723a(20) =364808a(21) =374573a(22) =425323a(23) =490915a(24) =592595a(25) =628015a(26) =725203a(27) =984343a(28) =1031803a(29) =1112023