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 | 3 |
| 3 | 6 |
| 4 | 13 |
| 5 | 15 |
| 6 | 26 |
| 7 | 30 |
| 8 | 55 |
| 9 | 61 |
| 10 | 63 |
| 11 | 3446 |
| 12 | 108996 |
| 13 | 3625183 |
| 14 | 13951973 |
| 15 | 28010902 |
| 16 | 7165572248 |
| 17 | 14335792540 |
| 18 | 114636743487 |
| 19 | 229264368710 |
| 20 | 458534096495 |