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.

A350403 Number of solutions to +-1^2 +- 2^2 +- 3^2 +- ... +- n^2 = 0 or 1.

Table of values

n a(n)
0 1
1 1
2 0
3 0
4 0
5 0
6 2
7 2
8 2
9 5
10 2
11 2
12 10
13 13
14 43
15 86
16 114
17 193
18 274
19 478
20 860
21 1552
22 3245
23 5808
24 10838
25 18628
26 31048
27 55626
28 100426
29 188536
30 372710
31 696164
32 1298600
33 2376996
34 4197425
35 7826992
36 14574366
37 27465147
38 53072709
39 100061106
40 187392994
41 351329160

List of values

[1, 1, 0, 0, 0, 0, 2, 2, 2, 5, 2, 2, 10, 13, 43, 86, 114, 193, 274, 478, 860, 1552, 3245, 5808, 10838, 18628, 31048, 55626, 100426, 188536, 372710, 696164, 1298600, 2376996, 4197425, 7826992, 14574366, 27465147, 53072709, 100061106, 187392994, 351329160]

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

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