A175370 a(n) = A175369(n^2).

1, 9, 81, 137, 321, 609, 1081, 1561, 2137, 3193, 4393, 4889, 6617, 8425, 9529, 11905, 14169, 17097, 18953, 21953, 25105, 29177, 32681, 35937, 41105, 46321, 50529, 55217, 62177, 67665, 74849, 80817, 87185, 96449, 104945, 112609, 120881, 130137

Offset

0,2

Comments

Number of integer 4-tuples (x,y,z,u) satisfying |x|^3+|y|^3+|z|^3+|u|^3 <= n^2, -n <= x,y,z <= n. If the cubes were replaced by squares, A055410 would result.

Links

Table of n, a(n) for n=0..37.

Crossrefs

Sequence in context: A207689 A209225 A208502 * A207695 A158028 A207591

Adjacent sequences: A175367 A175368 A175369 * A175371 A175372 A175373

Keyword

nonn

Author

R. J. Mathar, Apr 24 2010

Status

approved