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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.

A081890 a(n) = 9^n - 8^n - 7^n - 6^n + 3*5^n.

Table of values

n a(n)
0 1
1 3
2 7
3 33
4 643
5 11073
6 151867
7 1816713
8 19996963
9 208630833
10 2099398027
11 20597485593
12 198424412083
13 1885822419393
14 17740469253787
15 165580566245673
16 1535948935336003
17 14178113530908753
18 130361707324735147
19 1194785495130736953
20 10921581632007328723
21 99616564791408530913

List of values

[1, 3, 7, 33, 643, 11073, 151867, 1816713, 19996963, 208630833, 2099398027, 20597485593, 198424412083, 1885822419393, 17740469253787, 165580566245673, 1535948935336003, 14178113530908753, 130361707324735147, 1194785495130736953, 10921581632007328723, 99616564791408530913]

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

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