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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.

A033306 Triangle of coefficients of ordered cycle-index polynomials: T(n,k) = binomial(n,k)*Bell(k)*Bell(n-k).

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 2
5 2
6 5
7 6
8 6
9 5
10 15
11 20
12 24
13 20
14 15
15 52
16 75
17 100
18 100
19 75
20 52
21 203
22 312
23 450
24 500
25 450
26 312
27 203
28 877
29 1421
30 2184
31 2625
32 2625
33 2184
34 1421
35 877
36 4140
37 7016
38 11368
39 14560
40 15750
41 14560
42 11368
43 7016
44 4140
45 21147
46 37260
47 63144
48 85260
49 98280
50 98280
51 85260
52 63144
53 37260
54 21147

List of values

[1, 1, 1, 2, 2, 2, 5, 6, 6, 5, 15, 20, 24, 20, 15, 52, 75, 100, 100, 75, 52, 203, 312, 450, 500, 450, 312, 203, 877, 1421, 2184, 2625, 2625, 2184, 1421, 877, 4140, 7016, 11368, 14560, 15750, 14560, 11368, 7016, 4140, 21147, 37260, 63144, 85260, 98280, 98280, 85260, 63144, 37260, 21147]

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

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