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 | 1 |
| 3 | 8 |
| 4 | 84 |
| 5 | 139 |
| 6 | 2528 |
| 7 | 42293 |
| 8 | 198891 |
| 9 | 712178 |
| 10 | 714154 |
| 11 | 826684 |
| 12 | 3628625 |
| 13 | 12999736 |
| 14 | 84439174 |
| 15 | 135593913 |
| 16 | 136500523 |
| 17 | 2527472528 |
| 18 | 2637951184 |
| 19 | 3960451966 |
| 20 | 4094127596 |
| 21 | 4415308953 |
| 22 | 5192254461 |