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 | 6 |
| 3 | 16 |
| 4 | 43 |
| 5 | 120 |
| 6 | 340 |
| 7 | 972 |
| 8 | 2793 |
| 9 | 8050 |
| 10 | 23256 |
| 11 | 67324 |
| 12 | 195275 |
| 13 | 567448 |
| 14 | 1651830 |
| 15 | 4816328 |
| 16 | 14064569 |
| 17 | 41128626 |
| 18 | 120425604 |
| 19 | 353022920 |
| 20 | 1035983443 |
| 21 | 3043189688 |
| 22 | 8947381566 |
| 23 | 26328236756 |
| 24 | 77531471737 |
| 25 | 228475334594 |
| 26 | 673725464150 |