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 | 2 |
| 2 | 9 |
| 3 | 49 |
| 4 | 423 |
| 5 | 1333 |
| 6 | 4425 |
| 7 | 8763 |
| 8 | 14089 |
| 9 | 22825 |
| 10 | 40291 |
| 11 | 178705 |
| 12 | 661285 |
| 13 | 4543141 |
| 14 | 20706715 |
| 15 | 29243521 |
| 16 | 31089603 |
| 17 | 32341621 |
| 18 | 99158905 |
| 19 | 417976441 |
| 20 | 1186496401 |
| 21 | 1540962199 |
| 22 | 2097064537 |
| 23 | 8602909969 |