A175371 a(n) = A175369(n^3).

1, 9, 89, 617, 2137, 4897, 10625, 19777, 34625, 55217, 84441, 123385, 174329, 243145, 325929, 429329, 557169, 708961, 894625, 1110209, 1363561, 1656505, 1994281

Offset: 0

Author

R. J. Mathar, Apr 24 2010

Keywords

• nonn

Comments

Number of integer 4-tuples (x,y,z,u) satisfying |x|^3+|y|^3+|z|^3+|u|^3 <= n^3, -n <= x,y,z,u <= n.

An associated sequence with the number of 4-tuples satisfying x^2+y^2+z^2+u^2 <= n^3 starts 1, 9, 321, 3777, 20185, 77313, 230897,...