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) |
|---|---|
| 0 | 330 |
| 1 | 6336 |
| 2 | 61776 |
| 3 | 411840 |
| 4 | 2123550 |
| 5 | 9060480 |
| 6 | 33372768 |
| 7 | 109219968 |
| 8 | 324246780 |
| 9 | 886828800 |
| 10 | 2261413440 |
| 11 | 5427392256 |
| 12 | 12352970916 |
| 13 | 26829982080 |
| 14 | 55895796000 |
| 15 | 112183843200 |
| 16 | 217706770710 |
| 17 | 409800980160 |
| 18 | 750266946000 |
| 19 | 1339149240000 |
| 20 | 2335141487250 |
| 21 | 3985308138240 |