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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 44 |
| 6 | 167 |
| 7 | 695 |
| 8 | 3070 |
| 9 | 14074 |
| 10 | 65958 |
| 11 | 313098 |
| 12 | 1497216 |
| 13 | 7189646 |
| 14 | 34606966 |
| 15 | 166803484 |
| 16 | 804596882 |
| 17 | 3882748894 |
| 18 | 18741593296 |
| 19 | 90476092366 |
| 20 | 436812623774 |
| 21 | 2108996095916 |
| 22 | 10182801139146 |
| 23 | 49166003981046 |
| 24 | 237391983175872 |