cp's OEIS Frontend

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.

A217897 Triangular array read by rows. T(n,k) is the number of unlabeled functions on n nodes that have exactly k fixed points, n >= 0, 0 <= k <= n.

Table of values

n a(n)
0 1
1 0
2 1
3 1
4 1
5 1
6 2
7 3
8 1
9 1
10 6
11 7
12 4
13 1
14 1
15 13
16 19
17 9
18 4
19 1
20 1
21 40
22 47
23 27
24 10
25 4
26 1
27 1
28 100
29 130
30 68
31 29
32 10
33 4
34 1
35 1
36 291
37 343
38 195
39 76
40 30
41 10
42 4
43 1
44 1
45 797
46 951
47 523
48 220
49 78
50 30
51 10
52 4
53 1
54 1
55 2273
56 2615
57 1477
58 600
59 228
60 79
61 30
62 10
63 4
64 1
65 1
66 6389
67 7318
68 4096
69 1708
70 625
71 230
72 79
73 30
74 10
75 4
76 1
77 1

List of values

[1, 0, 1, 1, 1, 1, 2, 3, 1, 1, 6, 7, 4, 1, 1, 13, 19, 9, 4, 1, 1, 40, 47, 27, 10, 4, 1, 1, 100, 130, 68, 29, 10, 4, 1, 1, 291, 343, 195, 76, 30, 10, 4, 1, 1, 797, 951, 523, 220, 78, 30, 10, 4, 1, 1, 2273, 2615, 1477, 600, 228, 79, 30, 10, 4, 1, 1, 6389, 7318, 4096, 1708, 625, 230, 79, 30, 10, 4, 1, 1]