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 | 8 |
| 4 | 38 |
| 5 | 161 |
| 6 | 662 |
| 7 | 2672 |
| 8 | 10676 |
| 9 | 42398 |
| 10 | 167756 |
| 11 | 662252 |
| 12 | 2610758 |
| 13 | 10283861 |
| 14 | 40490702 |
| 15 | 159394424 |
| 16 | 627456188 |
| 17 | 2470223186 |
| 18 | 9726696572 |
| 19 | 38308366784 |
| 20 | 150916209308 |
| 21 | 594704861546 |
| 22 | 2344206594332 |
| 23 | 9243186573248 |
| 24 | 36456892635848 |