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) |
|---|---|
| 3 | 3 |
| 4 | 10 |
| 5 | 50 |
| 6 | 116 |
| 7 | 560 |
| 8 | 1730 |
| 9 | 6123 |
| 10 | 30122 |
| 11 | 116908 |
| 12 | 507277 |
| 13 | 2492737 |
| 14 | 15328119 |
| 15 | 56182092 |
| 16 | 441156796 |
| 17 | 2093130576 |
| 18 | 15965840718 |
| 19 | 77353276330 |
| 20 | 693400983344 |
| 21 | 3517825829117 |
| 22 | 35126205660152 |
| 23 | 187347585491624 |
| 24 | 1952969742765476 |