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.

A330381 Triangle read by rows: T(n,k) is the number of ternary strings of length n with k indispensable digits, with 0 <= k <= n.

Table of values

n a(n)
0 1
1 1
2 2
3 1
4 5
5 3
6 1
7 9
8 13
9 4
10 1
11 14
12 35
13 26
14 5
15 1
16 20
17 75
18 96
19 45
20 6
21 1
22 27
23 140
24 267
25 216
26 71
27 7
28 1
29 35
30 238
31 623
32 750
33 427
34 105
35 8
36 1
37 44
38 378
39 1288
40 2123
41 1800
42 770
43 148
44 9
45 1
46 54
47 570
48 2436
49 5211
50 6046
51 3858
52 1296
53 201
54 10
55 1
56 65
57 825
58 4302
59 11505
60 17303

List of values

[1, 1, 2, 1, 5, 3, 1, 9, 13, 4, 1, 14, 35, 26, 5, 1, 20, 75, 96, 45, 6, 1, 27, 140, 267, 216, 71, 7, 1, 35, 238, 623, 750, 427, 105, 8, 1, 44, 378, 1288, 2123, 1800, 770, 148, 9, 1, 54, 570, 2436, 5211, 6046, 3858, 1296, 201, 10, 1, 65, 825, 4302, 11505, 17303]