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 | 4 |
| 3 | 14 |
| 4 | 52 |
| 5 | 200 |
| 6 | 708 |
| 7 | 2642 |
| 8 | 10000 |
| 9 | 37984 |
| 10 | 144876 |
| 11 | 554120 |
| 12 | 2128672 |
| 13 | 8204180 |
| 14 | 31697564 |
| 15 | 122734614 |
| 16 | 476170124 |
| 17 | 1850664202 |
| 18 | 7204005752 |
| 19 | 28081918548 |
| 20 | 109604285492 |
| 21 | 428278469018 |
| 22 | 1675246478864 |
| 23 | 6559126501510 |
| 24 | 25703606447364 |