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 | 2 |
| 3 | 4 |
| 4 | 14 |
| 5 | 28 |
| 6 | 212 |
| 7 | 424 |
| 8 | 3060 |
| 9 | 13488 |
| 10 | 131212 |
| 11 | 262424 |
| 12 | 6444376 |
| 13 | 12888752 |
| 14 | 145241952 |
| 15 | 2146993212 |
| 16 | 40313750564 |
| 17 | 80627501128 |
| 18 | 2265599072684 |
| 19 | 4531198145368 |
| 20 | 173216179971224 |
| 21 | 3202520631881824 |
| 22 | 42018513097187068 |
| 23 | 84037026194374136 |
| 24 | 7051753589203676704 |
| 25 | 50056536119264986708 |