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 | 14 |
| 3 | 103 |
| 4 | 713 |
| 5 | 4894 |
| 6 | 33551 |
| 7 | 229969 |
| 8 | 1576238 |
| 9 | 10803703 |
| 10 | 74049689 |
| 11 | 507544126 |
| 12 | 3478759199 |
| 13 | 23843770273 |
| 14 | 163427632718 |
| 15 | 1120149658759 |
| 16 | 7677619978601 |
| 17 | 52623190191454 |
| 18 | 360684711361583 |
| 19 | 2472169789339633 |
| 20 | 16944503814015854 |