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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 1 |
| 10 | 8 |
| 11 | 79 |
| 12 | 754 |
| 13 | 7240 |
| 14 | 72828 |
| 15 | 784390 |
| 16 | 9099151 |
| 17 | 112170248 |
| 18 | 1434040695 |
| 19 | 18548321329 |
| 20 | 238131628435 |
| 21 | 2996684899641 |
| 22 | 36690482155548 |
| 23 | 435346012682054 |
| 24 | 4996906225153071 |
| 25 | 55453365806920084 |