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 | 7 |
| 4 | 30 |
| 5 | 124 |
| 6 | 733 |
| 7 | 4586 |
| 8 | 33373 |
| 9 | 259434 |
| 10 | 2152298 |
| 11 | 18615182 |
| 12 | 166544071 |
| 13 | 1528659536 |
| 14 | 14328433429 |
| 15 | 136649176084 |
| 16 | 1322594487342 |
| 17 | 12965736092988 |
| 18 | 128543259338048 |