Indices of even terms in A249064.

Terms

a(0) =2a(1) =5a(2) =10a(3) =19a(4) =36a(5) =59a(6) =92a(7) =139a(8) =202a(9) =267a(10) =362a(11) =485a(12) =614a(13) =781a(14) =868a(15) =1041a(16) =1248a(17) =1475a(18) =1730a(19) =1987a(20) =2266a(21) =2601a(22) =2964a(23) =3359a(24) =3806a(25) =4205a(26) =4672a(27) =5185a(28) =5712a(29) =6195