Numbers k such that 2*k^2+1 is a perfect power.

Terms

a(0) =0a(1) =2a(2) =11a(3) =12a(4) =70a(5) =408a(6) =2378a(7) =13860a(8) =80782a(9) =470832a(10) =2744210a(11) =15994428a(12) =93222358a(13) =543339720a(14) =3166815962a(15) =18457556052a(16) =107578520350a(17) =627013566048