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 | 6 |
| 2 | 34 |
| 3 | 190 |
| 4 | 1053 |
| 5 | 5624 |
| 6 | 28576 |
| 7 | 136758 |
| 8 | 613894 |
| 9 | 2583164 |
| 10 | 10208743 |
| 11 | 38013716 |
| 12 | 133872584 |
| 13 | 447620002 |
| 14 | 1426354541 |
| 15 | 4346885204 |
| 16 | 12710830673 |
| 17 | 35768703586 |
| 18 | 97125981825 |
| 19 | 255111287298 |
| 20 | 649598148384 |
| 21 | 1606754306778 |
| 22 | 3867515638005 |
| 23 | 9074220508038 |
| 24 | 20784247213232 |