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 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 6 |
| 5 | 13 |
| 6 | 19 |
| 7 | 24 |
| 8 | 116 |
| 9 | 139 |
| 10 | 6015 |
| 11 | 39112 |
| 12 | 65605 |
| 13 | 94020 |
| 14 | 1566318 |
| 15 | 2446259 |
| 16 | 3226100 |
| 17 | 5897845 |
| 18 | 85155749 |
| 19 | 1628068810 |
| 20 | 4244431852 |
| 21 | 14977877039 |
| 22 | 21118804085 |
| 23 | 110954554736 |