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 | 5 |
| 2 | 28 |
| 3 | 189 |
| 4 | 1232 |
| 5 | 7651 |
| 6 | 46440 |
| 7 | 279593 |
| 8 | 1679104 |
| 9 | 10076967 |
| 10 | 60465176 |
| 11 | 362795725 |
| 12 | 2176780608 |
| 13 | 13060691819 |
| 14 | 78364161352 |
| 15 | 470184981201 |
| 16 | 2821109903360 |
| 17 | 16926659439823 |
| 18 | 101559956662584 |
| 19 | 609359740003637 |