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 | 1 |
| 2 | 6 |
| 3 | 12 |
| 4 | 44 |
| 5 | 112 |
| 6 | 352 |
| 7 | 976 |
| 8 | 2912 |
| 9 | 8320 |
| 10 | 24384 |
| 11 | 70400 |
| 12 | 205056 |
| 13 | 594176 |
| 14 | 1726976 |
| 15 | 5010432 |
| 16 | 14552064 |
| 17 | 42237952 |
| 18 | 122642432 |
| 19 | 356028416 |
| 20 | 1033674752 |
| 21 | 3000893440 |
| 22 | 8712372224 |
| 23 | 25293619200 |
| 24 | 73433153536 |
| 25 | 213191294976 |
| 26 | 618940727296 |