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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.

A319501 Number T(n,k) of sets of nonempty words with a total of n letters over k-ary alphabet such that all k letters occur at least once in the set; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

Table of values

n a(n)
0 1
1 0
2 1
3 0
4 1
5 3
6 0
7 2
8 12
9 13
10 0
11 2
12 38
13 105
14 73
15 0
16 3
17 110
18 588
19 976
20 501
21 0
22 4
23 302
24 2811
25 8416
26 9945
27 4051
28 0
29 5
30 806
31 12354
32 59488
33 121710
34 111396
35 37633
36 0
37 6
38 2109
39 51543
40 375698
41 1185360
42 1830822
43 1366057
44 394353
45 0
46 8
47 5450
48 207846
49 2209276
50 10096795
51 23420022
52 28969248
53 18235680
54 4596553

List of values

[1, 0, 1, 0, 1, 3, 0, 2, 12, 13, 0, 2, 38, 105, 73, 0, 3, 110, 588, 976, 501, 0, 4, 302, 2811, 8416, 9945, 4051, 0, 5, 806, 12354, 59488, 121710, 111396, 37633, 0, 6, 2109, 51543, 375698, 1185360, 1830822, 1366057, 394353, 0, 8, 5450, 207846, 2209276, 10096795, 23420022, 28969248, 18235680, 4596553]