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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.

A378495 Triangle read by rows: T(n,k) is the number of derangements in S_n with no k-cycles. 1 <= k <= n.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 2
6 0
7 0
8 6
9 9
10 3
11 0
12 24
13 24
14 44
15 20
16 0
17 160
18 225
19 175
20 265
21 145
22 0
23 1140
24 1224
25 1434
26 1350
27 1854
28 1134
29 0
30 8988
31 11025
32 12313
33 12145
34 11473
35 14833
36 9793
37 0
38 80864
39 93456
40 100232
41 106280
42 113336
43 107576
44 133496
45 93176
46 0
47 809856
48 965601
49 1057761
50 1141425
51 1108161
52 1162161
53 1108161
54 1334961
55 972081

List of values

[0, 0, 0, 0, 2, 0, 0, 6, 9, 3, 0, 24, 24, 44, 20, 0, 160, 225, 175, 265, 145, 0, 1140, 1224, 1434, 1350, 1854, 1134, 0, 8988, 11025, 12313, 12145, 11473, 14833, 9793, 0, 80864, 93456, 100232, 106280, 113336, 107576, 133496, 93176, 0, 809856, 965601, 1057761, 1141425, 1108161, 1162161, 1108161, 1334961, 972081]

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

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