cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A319617 Number of Integer solutions to w^2 + x^2 + y^2 + z^2 < n^2; number of lattice points inside a 4-sphere of radius n.

Table of values

n a(n)
0 0
1 1
2 65
3 321
4 1257
5 2873
6 6265
7 11377
8 20161
9 31665
10 48945
11 71401
12 102041
13 139481
14 188753
15 247329
16 323697
17 409457
18 516121
19 640393
20 789161
21 955793
22 1153025
23 1376305
24 1637929
25 1921049
26 2252889
27 2615673
28 3033665
29 3483633
30 3990753
31 4547945
32 5173145
33 5840393
34 6589945
35 7395921
36 8287297
37 9238001
38 10281977
39 11402457
40 12633145
41 13929377

List of values

[0, 1, 65, 321, 1257, 2873, 6265, 11377, 20161, 31665, 48945, 71401, 102041, 139481, 188753, 247329, 323697, 409457, 516121, 640393, 789161, 955793, 1153025, 1376305, 1637929, 1921049, 2252889, 2615673, 3033665, 3483633, 3990753, 4547945, 5173145, 5840393, 6589945, 7395921, 8287297, 9238001, 10281977, 11402457, 12633145, 13929377]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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