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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.

A223815 T(n,k)=Number of nXk 0..2 arrays with row sums nondecreasing and column sums unimodal.

Table of values

n a(n)
1 3
2 9
3 6
4 22
5 50
6 10
7 46
8 337
9 222
10 15
11 86
12 1922
13 4120
14 867
15 21
16 148
17 9783
18 65465
19 43941
20 3123
21 28
22 239
23 45537
24 921010
25 1941904
26 426527
27 10660
28 36
29 367
30 198252
31 11789302
32 76453838
33 52310070
34 3875213
35 35064
36 45
37 541
38 817482
39 139965348
40 2740448352

List of values

[3, 9, 6, 22, 50, 10, 46, 337, 222, 15, 86, 1922, 4120, 867, 21, 148, 9783, 65465, 43941, 3123, 28, 239, 45537, 921010, 1941904, 426527, 10660, 36, 367, 198252, 11789302, 76453838, 52310070, 3875213, 35064, 45, 541, 817482, 139965348, 2740448352]

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

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