A055434 Number of points in Z^n of norm <= 10.

1, 21, 317, 4169, 49689, 532509, 5260181, 48218513, 415055025, 3375505573, 26107328109, 193280122713, 1374386800585, 9405092131245, 62077194367429, 396122100447649, 2449318034512737, 14705097001902901, 85877415063465373

Offset: 0

Author

David W. Wilson

Keywords

• nonn

Links

• Andrew Howroyd, Table of n, a(n) for n = 0..1000
• Index entries for linear recurrences with constant coefficients, order 101.
• Chai Wah Wu, Recurrence formula and generating function

Crossrefs

Row n=10 of A302997.

Programs

Mathematica

a[n_] := SeriesCoefficient[1/(1-x) Sum[x^(i^2), {i, -10, 10}]^n, {x, 0, 100}];
a /@ Range[0, 18] (* Jean-François Alcover, Sep 29 2019, from A302997 *)