Position of 2*n^2 in A000404 (sums of 2 nonzero squares).

Terms

a(0) =1a(1) =3a(2) =7a(3) =12a(4) =18a(5) =25a(6) =34a(7) =45a(8) =56a(9) =68a(10) =82a(11) =95a(12) =112a(13) =128a(14) =146a(15) =164a(16) =183a(17) =205a(18) =227a(19) =250a(20) =275a(21) =300a(22) =325a(23) =350a(24) =382a(25) =410a(26) =440a(27) =470a(28) =503a(29) =536