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.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 9 |
| 5 | 6 |
| 6 | 111 |
| 7 | -573 |
| 8 | 7638 |
| 9 | -95751 |
| 10 | 1450431 |
| 11 | -24643134 |
| 12 | 468589617 |
| 13 | -9843336567 |
| 14 | 226448287794 |
| 15 | -5662061186949 |
| 16 | 152892006728841 |
| 17 | -4434211761771978 |
| 18 | 137468475061977663 |
| 19 | -4536657554920874181 |
| 20 | 158788359466681092966 |
| 21 | -5875324355407515077439 |
| 22 | 229142457698060305226367 |