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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.

A352111 In the factorial base expansion of n, replace each place value, say k! with k > 0, by (-1)^(k-1) * k!.

Table of values

n a(n)
0 0
1 1
2 -2
3 -1
4 -4
5 -3
6 6
7 7
8 4
9 5
10 2
11 3
12 12
13 13
14 10
15 11
16 8
17 9
18 18
19 19
20 16
21 17
22 14
23 15
24 -24
25 -23
26 -26
27 -25
28 -28
29 -27
30 -18
31 -17
32 -20
33 -19
34 -22
35 -21
36 -12
37 -11
38 -14
39 -13
40 -16
41 -15
42 -6
43 -5
44 -8
45 -7
46 -10
47 -9
48 -48
49 -47
50 -50
51 -49
52 -52
53 -51
54 -42
55 -41
56 -44
57 -43
58 -46
59 -45

List of values

[0, 1, -2, -1, -4, -3, 6, 7, 4, 5, 2, 3, 12, 13, 10, 11, 8, 9, 18, 19, 16, 17, 14, 15, -24, -23, -26, -25, -28, -27, -18, -17, -20, -19, -22, -21, -12, -11, -14, -13, -16, -15, -6, -5, -8, -7, -10, -9, -48, -47, -50, -49, -52, -51, -42, -41, -44, -43, -46, -45]