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 | 2 |
| 2 | 5 |
| 3 | 8 |
| 4 | 65 |
| 5 | 163 |
| 6 | 1957 |
| 7 | 685 |
| 8 | 109601 |
| 9 | 98641 |
| 10 | 9864101 |
| 11 | 13563139 |
| 12 | 260412269 |
| 13 | 8463398743 |
| 14 | 47395032961 |
| 15 | 888656868019 |
| 16 | 56874039553217 |
| 17 | 7437374403113 |
| 18 | 17403456103284421 |
| 19 | 82666416490601 |
| 20 | 6613313319248080001 |
| 21 | 69439789852104840011 |