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 | 3 |
| 3 | 16 |
| 4 | 89 |
| 5 | 496 |
| 6 | 2795 |
| 7 | 15884 |
| 8 | 90909 |
| 9 | 523312 |
| 10 | 3026850 |
| 11 | 17577660 |
| 12 | 102425257 |
| 13 | 598575368 |
| 14 | 3506930635 |
| 15 | 20591787300 |
| 16 | 121145018325 |
| 17 | 713948286528 |
| 18 | 4214030403902 |
| 19 | 24907512574608 |
| 20 | 147403116947718 |