a(n) is the unique odd positive solution x of 2^n = 7x^2+y^2.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =1a(5) =5a(6) =7a(7) =3a(8) =17a(9) =11a(10) =23a(11) =45a(12) =1a(13) =91a(14) =89a(15) =93a(16) =271a(17) =85a(18) =457a(19) =627a(20) =287a(21) =1541a(22) =967a(23) =2115a(24) =4049a(25) =181a(26) =8279a(27) =7917a(28) =8641a(29) =24475