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 | 2 |
| 2 | 5 |
| 3 | 19 |
| 4 | 62 |
| 5 | 206 |
| 6 | 771 |
| 7 | 2787 |
| 8 | 10075 |
| 9 | 37936 |
| 10 | 142127 |
| 11 | 532438 |
| 12 | 2025548 |
| 13 | 7717368 |
| 14 | 29431808 |
| 15 | 112981883 |
| 16 | 434717592 |
| 17 | 1674938528 |
| 18 | 6474529712 |
| 19 | 25076461217 |
| 20 | 97253412518 |
| 21 | 377901902151 |
| 22 | 1470624876338 |
| 23 | 5729633180125 |
| 24 | 22352003680730 |