Powers of 2 with even digit sum.

Terms

a(0) =2a(1) =4a(2) =8a(3) =64a(4) =512a(5) =2048a(6) =8192a(7) =16384a(8) =32768a(9) =131072a(10) =2097152a(11) =67108864a(12) =4294967296a(13) =8589934592a(14) =68719476736a(15) =137438953472