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 | 0 |
| 2 | 8 |
| 3 | 89 |
| 4 | 537 |
| 5 | 2287 |
| 6 | 7471 |
| 7 | 20505 |
| 8 | 49689 |
| 9 | 108738 |
| 10 | 219738 |
| 11 | 416726 |
| 12 | 748502 |
| 13 | 1284570 |
| 14 | 2121490 |
| 15 | 3387115 |
| 16 | 5250795 |
| 17 | 7933293 |
| 18 | 11712429 |
| 19 | 16938987 |
| 20 | 24050987 |
| 21 | 33580556 |
| 22 | 46177140 |
| 23 | 62626924 |
| 24 | 83860588 |
| 25 | 110985588 |
| 26 | 145311516 |
| 27 | 188358237 |
| 28 | 241899165 |