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 | 4 |
| 3 | 11 |
| 4 | 37 |
| 5 | 163 |
| 6 | 907 |
| 7 | 6067 |
| 8 | 47107 |
| 9 | 415027 |
| 10 | 4084147 |
| 11 | 44363827 |
| 12 | 526994227 |
| 13 | 6793931827 |
| 14 | 94451224627 |
| 15 | 1408352613427 |
| 16 | 22418320792627 |
| 17 | 379413423256627 |
| 18 | 6802709918872627 |
| 19 | 128803497755800627 |
| 20 | 2568107879638168627 |
| 21 | 53780695151756440627 |
| 22 | 1180214324937540760627 |