Solve 2^n - 2 = 7(x^2 - x) + (y^2 - y) for (x,y) with x>0, y>0; a(n) = value of y.

Terms

a(0) =1a(1) =2a(2) =3a(3) =1a(4) =6a(5) =5a(6) =7a(7) =16a(8) =3a(9) =29a(10) =34a(11) =24a(12) =91a(13) =44a(14) =138a(15) =225a(16) =51a(17) =500a(18) =399a(19) =601a(20) =1398a(21) =197a(22) =2599a(23) =2992a(24) =2206a(25) =8189a(26) =3778a(27) =12600a(28) =20155a(29) =5045