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.

A306405 T(n,k) = k*Sum_{i=0..(n-k)/2} C(k,2*k+2*i-n)*C(k+2*i-1,i)/(k+i), triangle read by rows for n >= 1 and 1 <= k <= n.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 2
6 1
7 1
8 3
9 3
10 1
11 2
12 4
13 6
14 4
15 1
16 2
17 7
18 10
19 10
20 5
21 1
22 5
23 10
24 18
25 20
26 15
27 6
28 1
29 5
30 19
31 30
32 39
33 35
34 21
35 7
36 1
37 14
38 28
39 55
40 72
41 75
42 56
43 28
44 8
45 1
46 14
47 56
48 93
49 136
50 151
51 132
52 84
53 36
54 9
55 1
56 42
57 84
58 174
59 248
60 300
61 288
62 217
63 120
64 45
65 10
66 1

List of values

[1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 2, 4, 6, 4, 1, 2, 7, 10, 10, 5, 1, 5, 10, 18, 20, 15, 6, 1, 5, 19, 30, 39, 35, 21, 7, 1, 14, 28, 55, 72, 75, 56, 28, 8, 1, 14, 56, 93, 136, 151, 132, 84, 36, 9, 1, 42, 84, 174, 248, 300, 288, 217, 120, 45, 10, 1]