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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.

A081686 a(n) = 7^n - 6^n - 5^n - 4^n + 3*3^n.

Table of values

n a(n)
0 1
1 1
2 -1
3 19
4 467
5 5611
6 53459
7 455659
8 3648707
9 28119691
10 211372019
11 1562038699
12 11405181347
13 82545287371
14 593501306579
15 4245828252139
16 30255066944387
17 214924122640651
18 1522971386761139
19 10770190567911979
20 76039651374633827
21 536127709619251531
22 3775797660906839699
23 26567026101757594219

List of values

[1, 1, -1, 19, 467, 5611, 53459, 455659, 3648707, 28119691, 211372019, 1562038699, 11405181347, 82545287371, 593501306579, 4245828252139, 30255066944387, 214924122640651, 1522971386761139, 10770190567911979, 76039651374633827, 536127709619251531, 3775797660906839699, 26567026101757594219]

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

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