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 | 1 |
| 3 | 5 |
| 4 | 29 |
| 5 | 145 |
| 6 | 957 |
| 7 | 8397 |
| 8 | 85169 |
| 9 | 944221 |
| 10 | 11639417 |
| 11 | 160699437 |
| 12 | 2430145085 |
| 13 | 39776366397 |
| 14 | 703161838717 |
| 15 | 13369111112753 |
| 16 | 271734091323897 |