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 | 4 |
| 3 | 10 |
| 4 | 22 |
| 5 | 82 |
| 6 | 142 |
| 7 | 562 |
| 8 | 1402 |
| 9 | 3922 |
| 10 | 6442 |
| 11 | 34162 |
| 12 | 61882 |
| 13 | 422242 |
| 14 | 782602 |
| 15 | 1142962 |
| 16 | 1863682 |
| 17 | 14115922 |
| 18 | 26368162 |
| 19 | 259160722 |
| 20 | 491953282 |
| 21 | 724745842 |
| 22 | 957538402 |
| 23 | 6311767282 |
| 24 | 11665996162 |
| 25 | 38437140562 |
| 26 | 65208284962 |
| 27 | 145521718162 |
| 28 | 225835151362 |
| 29 | 2554924714162 |