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) |
|---|---|
| 2 | 1 |
| 3 | 13 |
| 4 | 130 |
| 5 | 1210 |
| 6 | 11011 |
| 7 | 99463 |
| 8 | 896260 |
| 9 | 8069620 |
| 10 | 72636421 |
| 11 | 653757313 |
| 12 | 5883904390 |
| 13 | 52955405230 |
| 14 | 476599444231 |
| 15 | 4289397389563 |
| 16 | 38604583680520 |
| 17 | 347441274648040 |
| 18 | 3126971536402441 |