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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.

A320205 Number of sets of nonempty words with a total of n letters over quaternary alphabet such that all letters occur at least once in the set.

Table of values

n a(n)
4 73
5 976
6 8416
7 59488
8 375698
9 2209276
10 12376430
11 66974912
12 353260192
13 1827146732
14 9306483104
15 46822023764
16 233203697318
17 1151770103264
18 5647971709608
19 27525892585476
20 133427763556914
21 643682934370820
22 3091947949892804
23 14794516505019096
24 70537743010768506

List of values

[73, 976, 8416, 59488, 375698, 2209276, 12376430, 66974912, 353260192, 1827146732, 9306483104, 46822023764, 233203697318, 1151770103264, 5647971709608, 27525892585476, 133427763556914, 643682934370820, 3091947949892804, 14794516505019096, 70537743010768506]

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

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