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 | 4 |
| 2 | 14 |
| 3 | 48 |
| 4 | 169 |
| 5 | 624 |
| 6 | 2442 |
| 7 | 10188 |
| 8 | 45452 |
| 9 | 217100 |
| 10 | 1109914 |
| 11 | 6064584 |
| 12 | 35330715 |
| 13 | 218788432 |
| 14 | 1435302930 |
| 15 | 9940062428 |
| 16 | 72422364227 |
| 17 | 553338786504 |
| 18 | 4420324121772 |
| 19 | 36820875272488 |
| 20 | 319053830821880 |
| 21 | 2869645346679368 |
| 22 | 26739383194844404 |
| 23 | 257682847299543248 |