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) |
|---|---|
| 3 | 204 |
| 4 | 1862 |
| 5 | 14700 |
| 6 | 109334 |
| 7 | 790524 |
| 8 | 5633222 |
| 9 | 39828300 |
| 10 | 280376054 |
| 11 | 1968934044 |
| 12 | 13807724582 |
| 13 | 96754776300 |
| 14 | 677686169174 |
| 15 | 4745413960764 |
| 16 | 33224340503942 |
| 17 | 232596153986700 |
| 18 | 1628276158432694 |
| 19 | 11398345428510684 |
| 20 | 79790067272259302 |
| 21 | 558537067986067500 |
| 22 | 3909785864202510614 |