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 | 9 |
| 3 | 51 |
| 4 | 230 |
| 5 | 863 |
| 6 | 2864 |
| 7 | 8609 |
| 8 | 23883 |
| 9 | 61883 |
| 10 | 151214 |
| 11 | 350929 |
| 12 | 778113 |
| 13 | 1656265 |
| 14 | 3398229 |
| 15 | 6743791 |
| 16 | 12983181 |
| 17 | 24311044 |
| 18 | 44377016 |
| 19 | 79124476 |
| 20 | 138048542 |
| 21 | 236050912 |
| 22 | 396137492 |
| 23 | 653285736 |
| 24 | 1059923072 |
| 25 | 1693592112 |
| 26 | 2667563553 |
| 27 | 4145373780 |
| 28 | 6360553548 |
| 29 | 9643151582 |