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 | 1 |
| 2 | 7 |
| 3 | 44 |
| 4 | 259 |
| 5 | 1509 |
| 6 | 8767 |
| 7 | 50973 |
| 8 | 296907 |
| 9 | 1733150 |
| 10 | 10138970 |
| 11 | 59435705 |
| 12 | 349085651 |
| 13 | 2053897585 |
| 14 | 12103791975 |
| 15 | 71432963850 |
| 16 | 422138418075 |
| 17 | 2497699796394 |
| 18 | 14794839261958 |
| 19 | 87725376843892 |
| 20 | 520654743222562 |
| 21 | 3092804089136541 |
| 22 | 18386738886807495 |
| 23 | 109390940367285906 |
| 24 | 651267699186002859 |