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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.

A184051 T(n,k) is the number of order-decreasing partial isometries (of an n-chain) with exactly k fixed points.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 2
5 1
6 5
7 4
8 3
9 1
10 13
11 6
12 6
13 4
14 1
15 30
16 10
17 10
18 10
19 5
20 1
21 66
22 14
23 15
24 20
25 15
26 6
27 1
28 137
29 22
30 21
31 35
32 35
33 21
34 7
35 1

List of values

[1, 1, 1, 2, 2, 1, 5, 4, 3, 1, 13, 6, 6, 4, 1, 30, 10, 10, 10, 5, 1, 66, 14, 15, 20, 15, 6, 1, 137, 22, 21, 35, 35, 21, 7, 1]