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.

A223987 T(n,k)=Number of nXk 0..3 arrays with rows unimodal and columns nondecreasing.

Table of values

n a(n)
1 4
2 16
3 10
4 50
5 100
6 20
7 130
8 684
9 400
10 35
11 296
12 3526
13 5029
14 1225
15 56
16 610
17 14751
18 44803
19 25410
20 3136
21 84
22 1163
23 52591
24 308470
25 358118
26 99634
27 7056
28 120
29 2083
30 165212
31 1738756
32 3770722
33 2086196
34 325120
35 14400
36 165
37 3544
38 468292
39 8350154
40 31585056

List of values

[4, 16, 10, 50, 100, 20, 130, 684, 400, 35, 296, 3526, 5029, 1225, 56, 610, 14751, 44803, 25410, 3136, 84, 1163, 52591, 308470, 358118, 99634, 7056, 120, 2083, 165212, 1738756, 3770722, 2086196, 325120, 14400, 165, 3544, 468292, 8350154, 31585056]

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

Content is available under The OEIS End-User License Agreement.