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 | 1 |
| 1 | 9 |
| 2 | 30 |
| 3 | 63 |
| 4 | 531 |
| 5 | 1050 |
| 6 | 405 |
| 7 | 6165 |
| 8 | 29610 |
| 9 | 44520 |
| 10 | 2511 |
| 11 | 59454 |
| 12 | 502821 |
| 13 | 1789614 |
| 14 | 2245320 |
| 15 | 15309 |
| 16 | 517104 |
| 17 | 6686631 |
| 18 | 41182344 |
| 19 | 120133692 |
| 20 | 131891760 |
| 21 | 92583 |
| 22 | 4214349 |
| 23 | 76790673 |
| 24 | 714174327 |
| 25 | 3559509360 |
| 26 | 8966770308 |
| 27 | 8862693840 |