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 | 2 |
| 3 | 105 |
| 4 | 210 |
| 5 | 20349 |
| 6 | 36075 |
| 7 | 40698 |
| 8 | 72150 |
| 9 | 7162155 |
| 10 | 9258795 |
| 11 | 14324310 |
| 12 | 18517590 |
| 13 | 117972855 |
| 14 | 156818025 |
| 15 | 235945710 |
| 16 | 313636050 |
| 17 | 5448196215 |
| 18 | 10896392430 |