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 | 29 |
| 3 | 263 |
| 4 | 1565 |
| 5 | 11217 |
| 6 | 74412 |
| 7 | 482638 |
| 8 | 2987123 |
| 9 | 18066149 |
| 10 | 107415185 |
| 11 | 623612637 |
| 12 | 3552605428 |
| 13 | 19882256022 |
| 14 | 109518424910 |
| 15 | 594290145192 |
| 16 | 3179607733480 |
| 17 | 16790129919934 |
| 18 | 87573088547032 |
| 19 | 451477766533886 |
| 20 | 2302069862201553 |
| 21 | 11616226357007259 |
| 22 | 58036597014533469 |