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 | 20 |
| 2 | 200 |
| 3 | 1340 |
| 4 | 6800 |
| 5 | 28004 |
| 6 | 97880 |
| 7 | 299660 |
| 8 | 822560 |
| 9 | 2060980 |
| 10 | 4780008 |
| 11 | 10377180 |
| 12 | 21278640 |
| 13 | 41517060 |
| 14 | 77548920 |
| 15 | 139380012 |
| 16 | 242080320 |
| 17 | 407782740 |
| 18 | 668274440 |
| 19 | 1068305020 |
| 20 | 1669752016 |
| 21 | 2556801700 |
| 22 | 3842321560 |
| 23 | 5675620300 |