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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.

A302233 Square array A(n,k), n >= 0, k >= 1, read by antidiagonals, where column k is the expansion of Product_{j>=1} (1 + x^(k*j))/(1 + x^j).

Table of values

n a(n)
0 1
1 1
2 0
3 1
4 -1
5 0
6 1
7 -1
8 1
9 0
10 1
11 -1
12 0
13 -2
14 0
15 1
16 -1
17 0
18 0
19 2
20 0
21 1
22 -1
23 0
24 -1
25 0
26 -3
27 0
28 1
29 -1
30 0
31 -1
32 2
33 -1
34 4
35 0
36 1
37 -1
38 0
39 -1
40 1
41 -2
42 1
43 -5
44 0
45 1
46 -1
47 0
48 -1
49 1
50 0
51 1
52 -1
53 6
54 0
55 1
56 -1
57 0
58 -1
59 1
60 -1
61 0
62 -2
63 1
64 -8
65 0
66 1
67 -1
68 0
69 -1
70 1
71 -1
72 2
73 -1
74 4
75 0
76 10
77 0
78 1
79 -1
80 0
81 -1
82 1
83 -1
84 1
85 -2
86 1
87 -4
88 0
89 -12
90 0

List of values

[1, 1, 0, 1, -1, 0, 1, -1, 1, 0, 1, -1, 0, -2, 0, 1, -1, 0, 0, 2, 0, 1, -1, 0, -1, 0, -3, 0, 1, -1, 0, -1, 2, -1, 4, 0, 1, -1, 0, -1, 1, -2, 1, -5, 0, 1, -1, 0, -1, 1, 0, 1, -1, 6, 0, 1, -1, 0, -1, 1, -1, 0, -2, 1, -8, 0, 1, -1, 0, -1, 1, -1, 2, -1, 4, 0, 10, 0, 1, -1, 0, -1, 1, -1, 1, -2, 1, -4, 0, -12, 0]