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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 29 |
| 5 | 233 |
| 6 | 7457 |
| 7 | 1908993 |
| 8 | 15638470657 |
| 9 | 32796250015268865 |
| 10 | 563435284988077103288156161 |
| 11 | 20299895516157546089301785397257605216206849 |
| 12 | 12565026726380593749379544715414757684521993402717913413208480665305089 |