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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.

A097804 a(n) = 3*(2*5^n + 1).

Table of values

n a(n)
0 9
1 33
2 153
3 753
4 3753
5 18753
6 93753
7 468753
8 2343753
9 11718753
10 58593753
11 292968753
12 1464843753
13 7324218753
14 36621093753
15 183105468753
16 915527343753
17 4577636718753
18 22888183593753
19 114440917968753
20 572204589843753
21 2861022949218753
22 14305114746093753

List of values

[9, 33, 153, 753, 3753, 18753, 93753, 468753, 2343753, 11718753, 58593753, 292968753, 1464843753, 7324218753, 36621093753, 183105468753, 915527343753, 4577636718753, 22888183593753, 114440917968753, 572204589843753, 2861022949218753, 14305114746093753]

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

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