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) |
|---|---|
| 1 | 56 |
| 2 | 196 |
| 3 | 686 |
| 4 | 2254 |
| 5 | 7586 |
| 6 | 25774 |
| 7 | 86828 |
| 8 | 292621 |
| 9 | 988303 |
| 10 | 3335451 |
| 11 | 11253229 |
| 12 | 37977866 |
| 13 | 128168421 |
| 14 | 432512171 |
| 15 | 1459576829 |
| 16 | 4925618766 |
| 17 | 16622258696 |
| 18 | 56094381015 |
| 19 | 189299674740 |
| 20 | 638822175369 |
| 21 | 2155807165360 |
| 22 | 7275117316894 |