Numbers with exactly 2 0's in their base 4 expansion.

Terms

a(0) =16a(1) =32a(2) =48a(3) =65a(4) =66a(5) =67a(6) =68a(7) =72a(8) =76a(9) =80a(10) =96a(11) =112a(12) =129a(13) =130a(14) =131a(15) =132a(16) =136a(17) =140a(18) =144a(19) =160a(20) =176a(21) =193a(22) =194a(23) =195a(24) =196a(25) =200a(26) =204a(27) =208a(28) =224a(29) =240