A055429 Number of points in Z^n of norm <= 5.

1, 11, 81, 515, 3121, 16875, 84769, 394691, 1733537, 7129227, 27634481, 102386243, 365127249, 1256538091, 4180101249, 13457728387, 41966634049, 126929576971, 373074639633, 1067860637059, 2981845163377, 8133266915563

Offset

0,2

Links

Andrew Howroyd, Table of n, a(n) for n = 0..1000

Mathematica

a[n_] := SeriesCoefficient[1/(1-x) Sum[x^(i^2), {i, -5, 5}]^n, {x, 0, 25}];
a /@ Range[0, 21] (* Jean-François Alcover, Sep 29 2019, from A302997 *)

Crossrefs

Row n=5 of A302997.

Sequence in context: A323223 A211557 A333061 * A227556 A181989 A199557

Adjacent sequences: A055426 A055427 A055428 * A055430 A055431 A055432

Keyword

nonn

Author

David W. Wilson

Status

approved