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.

A226513 Array read by antidiagonals: T(n,k) = number of barred preferential arrangements of k things with n bars (k >=0, n >= 0).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 3
6 1
7 3
8 8
9 13
10 1
11 4
12 15
13 44
14 75
15 1
16 5
17 24
18 99
19 308
20 541
21 1
22 6
23 35
24 184
25 807
26 2612
27 4683
28 1
29 7
30 48
31 305
32 1704
33 7803
34 25988
35 47293
36 1
37 8
38 63
39 468
40 3155
41 18424
42 87135
43 296564
44 545835
45 1
46 9
47 80
48 679
49 5340
50 37625
51 227304
52 1102419
53 3816548
54 7087261

List of values

[1, 1, 1, 1, 2, 3, 1, 3, 8, 13, 1, 4, 15, 44, 75, 1, 5, 24, 99, 308, 541, 1, 6, 35, 184, 807, 2612, 4683, 1, 7, 48, 305, 1704, 7803, 25988, 47293, 1, 8, 63, 468, 3155, 18424, 87135, 296564, 545835, 1, 9, 80, 679, 5340, 37625, 227304, 1102419, 3816548, 7087261]