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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.

A158380 Number of solutions to +-1 +- 3 +- 6 +- ... +- n(n+1)/2 = 0.

Table of values

n a(n)
0 1
1 0
2 0
3 0
4 2
5 0
6 2
7 2
8 4
9 0
10 12
11 16
12 26
13 0
14 66
15 104
16 210
17 0
18 620
19 970
20 1748
21 0
22 5948
23 10480
24 18976
25 0
26 60836
27 111430
28 209460
29 0
30 704934
31 1284836
32 2387758
33 0
34 8331820
35 15525814
36 28987902
37 0
38 101242982
39 190267598
40 358969426
41 0
42 1275032260
43 2404124188
44 4547419694

List of values

[1, 0, 0, 0, 2, 0, 2, 2, 4, 0, 12, 16, 26, 0, 66, 104, 210, 0, 620, 970, 1748, 0, 5948, 10480, 18976, 0, 60836, 111430, 209460, 0, 704934, 1284836, 2387758, 0, 8331820, 15525814, 28987902, 0, 101242982, 190267598, 358969426, 0, 1275032260, 2404124188, 4547419694]

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

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