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.

A155856 Triangle T(n,k) = binomial(2*n-k, k)*(n-k)!, read by rows.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 3
5 1
6 6
7 10
8 6
9 1
10 24
11 42
12 30
13 10
14 1
15 120
16 216
17 168
18 70
19 15
20 1
21 720
22 1320
23 1080
24 504
25 140
26 21
27 1
28 5040
29 9360
30 7920
31 3960
32 1260
33 252
34 28
35 1
36 40320
37 75600
38 65520
39 34320
40 11880
41 2772
42 420
43 36
44 1
45 362880
46 685440
47 604800
48 327600
49 120120
50 30888
51 5544
52 660
53 45
54 1

List of values

[1, 1, 1, 2, 3, 1, 6, 10, 6, 1, 24, 42, 30, 10, 1, 120, 216, 168, 70, 15, 1, 720, 1320, 1080, 504, 140, 21, 1, 5040, 9360, 7920, 3960, 1260, 252, 28, 1, 40320, 75600, 65520, 34320, 11880, 2772, 420, 36, 1, 362880, 685440, 604800, 327600, 120120, 30888, 5544, 660, 45, 1]