x such that x^2 - 27*y^2 = 1.A114052x such that x^2 - 27*y^2 = 1.Terms a(0) =1a(1) =26a(2) =1351a(3) =70226a(4) =3650401a(5) =189750626a(6) =9863382151a(7) =512706121226External referencesoeis: A114052