A350982 a(0)=0, a(1)=49, thereafter a(n) = 14*a(n-1)-a(n-2)+42.

0, 49, 728, 10185, 141904, 1976513, 27529320, 383434009, 5340546848, 74384221905, 1036038559864, 14430155616233, 200986140067440, 2799375805327969, 38990275134524168, 543064476078010425, 7563912389957621824, 105351708983328695153, 1467360013376644110360, 20437688478289688849929

Offset: 0

Author

N. J. A. Sloane, Mar 08 2022

Keywords

• nonn

Comments

Arises in studying the equation x^3 - 7*y^2 = 1.

References

• P.-F. Teilhet, Query 2228, L'Intermédiaire des Mathématiciens, 11 (1904), 44-45.

Crossrefs

Cf. A144929, A350979, A350980, A350981.