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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.

A184129 T(n,k)=Number of nXk 0..3 arrays with rows and columns in nondecreasing order.

Table of values

n a(n)
1 4
2 10
3 10
4 20
5 86
6 20
7 35
8 561
9 561
10 35
11 56
12 2861
13 14178
14 2861
15 56
16 84
17 12068
18 276427
19 276427
20 12068
21 84
22 120
23 43947
24 4249486
25 21907055
26 4249486
27 43947
28 120
29 165
30 142376
31 53817407
32 1361812470
33 1361812470
34 53817407
35 142376
36 165
37 220
38 419213
39 581588614

List of values

[4, 10, 10, 20, 86, 20, 35, 561, 561, 35, 56, 2861, 14178, 2861, 56, 84, 12068, 276427, 276427, 12068, 84, 120, 43947, 4249486, 21907055, 4249486, 43947, 120, 165, 142376, 53817407, 1361812470, 1361812470, 53817407, 142376, 165, 220, 419213, 581588614]

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

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