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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 15 |
| 4 | 39 |
| 5 | 103 |
| 6 | 269 |
| 7 | 700 |
| 8 | 1821 |
| 9 | 4736 |
| 10 | 12313 |
| 11 | 32016 |
| 12 | 83242 |
| 13 | 216429 |
| 14 | 562716 |
| 15 | 1463063 |
| 16 | 3803966 |
| 17 | 9890311 |
| 18 | 25714810 |
| 19 | 66858508 |
| 20 | 173832121 |
| 21 | 451963515 |
| 22 | 1175105140 |
| 23 | 3055273364 |
| 24 | 7943710747 |
| 25 | 20653647942 |
| 26 | 53699484649 |