The status of further terms is:
15 integral solution: unknown
16 integral solution: 503
17 integral solution: unknown
18 integral solution: 431
19 integral solution: unknown
20 integral solution: 2351
21 integral solution: unknown
22 integral solution: 3807
For least positive k such that equation y^2 = x^3 + k has exactly n integral solutions, see A179162.
If n is odd, then a(n) is perfect cube. [Ray Chandler]
