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.

A320905 T(n, k) = binomial(2*n - 1 - k, k - 1)*hypergeom([2, 2, 1-k], [1, 1 - 2*k + 2*n], -1), triangle read by rows, T(n, k) for n >= 1 and 1 <= k <= n.

Table of values

n a(n)
1 1
2 1
3 5
4 1
5 7
6 18
7 1
8 9
9 31
10 56
11 1
12 11
13 48
14 111
15 160
16 1
17 13
18 69
19 198
20 351
21 432
22 1
23 15
24 94
25 325
26 699
27 1023
28 1120
29 1
30 17
31 123
32 500
33 1280
34 2223
35 2815
36 2816
37 1
38 19
39 156
40 731
41 2186
42 4458
43 6562
44 7423
45 6912
46 1
47 21
48 193
49 1026
50 3525
51 8330
52 14198
53 18324
54 18943
55 16640

List of values

[1, 1, 5, 1, 7, 18, 1, 9, 31, 56, 1, 11, 48, 111, 160, 1, 13, 69, 198, 351, 432, 1, 15, 94, 325, 699, 1023, 1120, 1, 17, 123, 500, 1280, 2223, 2815, 2816, 1, 19, 156, 731, 2186, 4458, 6562, 7423, 6912, 1, 21, 193, 1026, 3525, 8330, 14198, 18324, 18943, 16640]