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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.

A350287 Number of solutions to +-1 +- 3 +- 6 +- 10 +- ... +- n*(n + 1)/2 = 0 or 1.

Table of values

n a(n)
0 1
1 1
2 0
3 0
4 2
5 1
6 2
7 2
8 4
9 7
10 12
11 16
12 26
13 42
14 66
15 104
16 210
17 318
18 620
19 970
20 1748
21 3281
22 5948
23 10480
24 18976
25 34233
26 60836
27 111430
28 209460
29 378529
30 704934
31 1284836
32 2387758
33 4466874
34 8331820
35 15525814
36 28987902
37 54162165
38 101242982
39 190267598
40 358969426
41 674845081

List of values

[1, 1, 0, 0, 2, 1, 2, 2, 4, 7, 12, 16, 26, 42, 66, 104, 210, 318, 620, 970, 1748, 3281, 5948, 10480, 18976, 34233, 60836, 111430, 209460, 378529, 704934, 1284836, 2387758, 4466874, 8331820, 15525814, 28987902, 54162165, 101242982, 190267598, 358969426, 674845081]

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

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