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 | 45 |
| 2 | 855 |
| 3 | 12600 |
| 4 | 166500 |
| 5 | 2070000 |
| 6 | 24750000 |
| 7 | 288000000 |
| 8 | 3285000000 |
| 9 | 36900000000 |
| 10 | 409500000000 |
| 11 | 4500000000000 |
| 12 | 49050000000000 |
| 13 | 531000000000000 |
| 14 | 5715000000000000 |
| 15 | 61200000000000000 |
| 16 | 652500000000000000 |
| 17 | 6930000000000000000 |
| 18 | 73350000000000000000 |