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 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 33 |
| 6 | 125 |
| 7 | 503 |
| 8 | 2081 |
| 9 | 8849 |
| 10 | 38345 |
| 11 | 168875 |
| 12 | 753401 |
| 13 | 3398177 |
| 14 | 15469493 |
| 15 | 70984559 |
| 16 | 327982529 |
| 17 | 1524644897 |
| 18 | 7125440913 |
| 19 | 33459931155 |
| 20 | 157794990633 |
| 21 | 747021246817 |
| 22 | 3548843286829 |
| 23 | 16912921740775 |
| 24 | 80836929471329 |
| 25 | 387397148131889 |
| 26 | 1861088017162457 |