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 | 13 |
| 4 | 20 |
| 5 | 47 |
| 6 | 92 |
| 7 | 175 |
| 8 | 248 |
| 9 | 1695 |
| 10 | 1768 |
| 11 | 22685 |
| 12 | 41367 |
| 13 | 49532 |
| 14 | 178582 |
| 15 | 420452 |
| 16 | 1940278 |
| 17 | 13957468 |
| 18 | 20258760 |