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.

A038719 Triangle T(n,k) (0 <= k <= n) giving number of chains of length k in partially ordered set formed from subsets of n-set by inclusion.

Table of values

n a(n)
0 1
1 2
2 1
3 4
4 5
5 2
6 8
7 19
8 18
9 6
10 16
11 65
12 110
13 84
14 24
15 32
16 211
17 570
18 750
19 480
20 120
21 64
22 665
23 2702
24 5460
25 5880
26 3240
27 720
28 128
29 2059
30 12138
31 35406
32 57120
33 52080
34 25200
35 5040
36 256
37 6305
38 52670
39 213444
40 484344
41 650160
42 514080
43 221760
44 40320
45 512
46 19171

List of values

[1, 2, 1, 4, 5, 2, 8, 19, 18, 6, 16, 65, 110, 84, 24, 32, 211, 570, 750, 480, 120, 64, 665, 2702, 5460, 5880, 3240, 720, 128, 2059, 12138, 35406, 57120, 52080, 25200, 5040, 256, 6305, 52670, 213444, 484344, 650160, 514080, 221760, 40320, 512, 19171]

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

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