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 | 3 |
| 3 | 13 |
| 4 | 25 |
| 5 | 111 |
| 6 | 493 |
| 7 | 949 |
| 8 | 4215 |
| 9 | 18721 |
| 10 | 36037 |
| 11 | 160059 |
| 12 | 710905 |
| 13 | 1368457 |
| 14 | 6078027 |
| 15 | 26995669 |
| 16 | 51965329 |
| 17 | 230804967 |
| 18 | 1025124517 |
| 19 | 1973314045 |
| 20 | 8764510719 |
| 21 | 38927735977 |
| 22 | 74933968381 |
| 23 | 332820602355 |
| 24 | 1478228842609 |
| 25 | 2845517484433 |
| 26 | 12638418378771 |