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 | 120 |
| 2 | 528 |
| 3 | 1485 |
| 4 | 3240 |
| 5 | 58653 |
| 6 | 70125 |
| 7 | 139128 |
| 8 | 609960 |
| 9 | 886446 |
| 10 | 902496 |
| 11 | 1062153 |
| 12 | 1844160 |
| 13 | 4017195 |
| 14 | 8386560 |
| 15 | 8759205 |
| 16 | 38618866 |
| 17 | 39760903 |
| 18 | 122062500 |
| 19 | 160554240 |
| 20 | 703893960 |
| 21 | 741105750 |
| 22 | 797222415 |
| 23 | 6115239936 |
| 24 | 10854464130 |
| 25 | 23667373395 |
| 26 | 82103447700 |
| 27 | 131197213890 |