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 | 30 |
| 2 | 315 |
| 3 | 1960 |
| 4 | 8820 |
| 5 | 31752 |
| 6 | 97020 |
| 7 | 261360 |
| 8 | 637065 |
| 9 | 1431430 |
| 10 | 3006003 |
| 11 | 5962320 |
| 12 | 11262160 |
| 13 | 20391840 |
| 14 | 35581680 |
| 15 | 60093504 |
| 16 | 98590905 |
| 17 | 157608990 |
| 18 | 246142435 |
| 19 | 376372920 |
| 20 | 564559380 |
| 21 | 832117000 |
| 22 | 1206913500 |
| 23 | 1724814000 |
| 24 | 2431508625 |