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 | 225 |
| 3 | 315 |
| 4 | 1155 |
| 5 | 4725 |
| 6 | 10395 |
| 7 | 17325 |
| 8 | 45045 |
| 9 | 255255 |
| 10 | 363825 |
| 11 | 675675 |
| 12 | 1576575 |
| 13 | 2297295 |
| 14 | 3828825 |
| 15 | 14189175 |
| 16 | 14549535 |
| 17 | 23648625 |
| 18 | 34459425 |
| 19 | 52026975 |