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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.

A301704 a(n) is the number of negative coefficients of polynomial (x-1)*(x^2-1)*...*(x^n-1).

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 6
6 8
7 9
8 12
9 16
10 18
11 21
12 26
13 34
14 32
15 42
16 50
17 54
18 64
19 73
20 82
21 85
22 96
23 104
24 116
25 123
26 134
27 150
28 162
29 174
30 182
31 200
32 216
33 234
34 252
35 263
36 286
37 301
38 322
39 322
40 340
41 368
42 376
43 413
44 414
45 451
46 460
47 487
48 518
49 531
50 580
51 592
52 638
53 631
54 684
55 687
56 728
57 734
58 744
59 793
60 800
61 859
62 854
63 917
64 936
65 977
66 1000
67 1037
68 1088
69 1108
70 1166

List of values

[1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 21, 26, 34, 32, 42, 50, 54, 64, 73, 82, 85, 96, 104, 116, 123, 134, 150, 162, 174, 182, 200, 216, 234, 252, 263, 286, 301, 322, 322, 340, 368, 376, 413, 414, 451, 460, 487, 518, 531, 580, 592, 638, 631, 684, 687, 728, 734, 744, 793, 800, 859, 854, 917, 936, 977, 1000, 1037, 1088, 1108, 1166]