Numbers whose base-4 representation contains exactly one 1 and four 2's.

Terms

a(0) =426a(1) =618a(2) =666a(3) =678a(4) =681a(5) =1194a(6) =1578a(7) =1674a(8) =1698a(9) =1704a(10) =1707a(11) =1710a(12) =1722a(13) =1770a(14) =1962a(15) =2154a(16) =2202a(17) =2214a(18) =2217a(19) =2346a(20) =2442a(21) =2466a(22) =2472a(23) =2475a(24) =2478a(25) =2490a(26) =2538a(27) =2586a(28) =2598a(29) =2601