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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.

A165738 Rank deficiency (= dimension of the null space) of the n X n "Lights Out" puzzle on a torus.

Table of values

n a(n)
1 0
2 0
3 4
4 0
5 8
6 8
7 0
8 0
9 4
10 16
11 0
12 16
13 0
14 0
15 12
16 0
17 16
18 8
19 0
20 32
21 4
22 0
23 0
24 32
25 8
26 0
27 4
28 0
29 0
30 24
31 40
32 0
33 44
34 32
35 8
36 16
37 0
38 0
39 4
40 64
41 0
42 8
43 0
44 0
45 12
46 0
47 0
48 64
49 0
50 16
51 20
52 0
53 0
54 8
55 8
56 0
57 4
58 0
59 0
60 48
61 0
62 80
63 52
64 0
65 56
66 88
67 0
68 64
69 4
70 16
71 0
72 32
73 0
74 0
75 12
76 0
77 0
78 8
79 0
80 128
81 4
82 0
83 0
84 16
85 24
86 0
87 4
88 0
89 0
90 24

List of values

[0, 0, 4, 0, 8, 8, 0, 0, 4, 16, 0, 16, 0, 0, 12, 0, 16, 8, 0, 32, 4, 0, 0, 32, 8, 0, 4, 0, 0, 24, 40, 0, 44, 32, 8, 16, 0, 0, 4, 64, 0, 8, 0, 0, 12, 0, 0, 64, 0, 16, 20, 0, 0, 8, 8, 0, 4, 0, 0, 48, 0, 80, 52, 0, 56, 88, 0, 64, 4, 16, 0, 32, 0, 0, 12, 0, 0, 8, 0, 128, 4, 0, 0, 16, 24, 0, 4, 0, 0, 24]