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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.

A081687 a(n) = 8^n - 7^n - 6^n - 5^n + 3*4^n.

Table of values

n a(n)
0 1
1 2
2 2
3 20
4 542
5 8132
6 94502
7 964700
8 9138782
9 82619732
10 724180502
11 6213565580
12 52507598222
13 438786732932
14 3636161064902
15 29939329241660
16 245281233244862
17 2001531240407732
18 16280816416067702
19 132088684297864940
20 1069381010972414702
21 8642425579112444132
22 69743202133180068902

List of values

[1, 2, 2, 20, 542, 8132, 94502, 964700, 9138782, 82619732, 724180502, 6213565580, 52507598222, 438786732932, 3636161064902, 29939329241660, 245281233244862, 2001531240407732, 16280816416067702, 132088684297864940, 1069381010972414702, 8642425579112444132, 69743202133180068902]

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

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