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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.

A320204 Number of sets of nonempty words with a total of n letters over ternary alphabet such that all letters occur at least once in the set.

Table of values

n a(n)
3 13
4 105
5 588
6 2811
7 12354
8 51543
9 207846
10 818241
11 3165036
12 12078462
13 45602379
14 170665569
15 633997185
16 2340201492
17 8589679914
18 31370151073
19 114045173001
20 412880470680
21 1489008227689
22 5350719651144
23 19163305147338
24 68416338358689
25 243533302332309
26 864441624894750

List of values

[13, 105, 588, 2811, 12354, 51543, 207846, 818241, 3165036, 12078462, 45602379, 170665569, 633997185, 2340201492, 8589679914, 31370151073, 114045173001, 412880470680, 1489008227689, 5350719651144, 19163305147338, 68416338358689, 243533302332309, 864441624894750]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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