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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.

A122218 Pascal array A(n,p,k) for selection of k elements from two sets L and U with n elements in total whereat the nl = n - p elements in L are labeled and the nu = p elements in U are unlabeled and (in this example) with p = 2 (read by rows).

Table of values

n a(n)
0 0
1 0
2 0
3 1
4 1
5 1
6 1
7 2
8 2
9 1
10 1
11 3
12 4
13 3
14 1
15 1
16 4
17 7
18 7
19 4
20 1
21 1
22 5
23 11
24 14
25 11
26 5
27 1
28 1
29 6
30 16
31 25
32 25
33 16
34 6
35 1
36 1
37 7
38 22
39 41
40 50
41 41
42 22
43 7
44 1
45 1
46 8
47 29
48 63
49 91
50 91
51 63
52 29
53 8
54 1
55 1
56 9
57 37
58 92
59 154
60 182
61 154
62 92
63 37
64 9
65 1

List of values

[0, 0, 0, 1, 1, 1, 1, 2, 2, 1, 1, 3, 4, 3, 1, 1, 4, 7, 7, 4, 1, 1, 5, 11, 14, 11, 5, 1, 1, 6, 16, 25, 25, 16, 6, 1, 1, 7, 22, 41, 50, 41, 22, 7, 1, 1, 8, 29, 63, 91, 91, 63, 29, 8, 1, 1, 9, 37, 92, 154, 182, 154, 92, 37, 9, 1]

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

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