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.

A331568 Array read by antidiagonals: A(n,k) is the number of nonnegative integer matrices with k columns and any number of distinct nonzero rows with column sums n.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 1
6 1
7 3
8 1
9 1
10 1
11 13
12 13
13 3
14 1
15 1
16 75
17 313
18 87
19 3
20 1
21 1
22 541
23 14797
24 11655
25 539
26 5
27 1
28 1
29 4683
30 1095601
31 4498191
32 439779
33 2483
34 11
35 1
36 1
37 47293
38 119621653
39 3611504823
40 1390686419
41 14699033
42 14567
43 13
44 1
45 1
46 545835
47 17943752233
48 5192498314767
49 12006713338683
50 397293740555
51 453027131
52 81669
53 19
54 1

List of values

[1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 13, 13, 3, 1, 1, 75, 313, 87, 3, 1, 1, 541, 14797, 11655, 539, 5, 1, 1, 4683, 1095601, 4498191, 439779, 2483, 11, 1, 1, 47293, 119621653, 3611504823, 1390686419, 14699033, 14567, 13, 1, 1, 545835, 17943752233, 5192498314767, 12006713338683, 397293740555, 453027131, 81669, 19, 1]