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 | 1 |
| 2 | 7 |
| 3 | 37 |
| 4 | 223 |
| 5 | 1297 |
| 6 | 7819 |
| 7 | 46657 |
| 8 | 280159 |
| 9 | 1679653 |
| 10 | 10078999 |
| 11 | 60466177 |
| 12 | 362805091 |
| 13 | 2176782337 |
| 14 | 13060740679 |
| 15 | 78364165429 |
| 16 | 470185264735 |
| 17 | 2821109907457 |
| 18 | 16926661132171 |
| 19 | 101559956668417 |
| 20 | 609359750089711 |
| 21 | 3656158440109669 |
| 22 | 21936950700844039 |
| 23 | 131621703842267137 |