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 | 13 |
| 3 | 11 |
| 4 | 80 |
| 5 | 579 |
| 6 | 2963 |
| 7 | 12224 |
| 8 | 72620 |
| 9 | 426475 |
| 10 | 2284203 |
| 11 | 12768382 |
| 12 | 72904621 |
| 13 | 409673880 |
| 14 | 2298677918 |
| 15 | 13008113489 |
| 16 | 73461302729 |
| 17 | 414141245069 |
| 18 | 2338885431088 |
| 19 | 13210876247129 |
| 20 | 74582366744334 |
| 21 | 421146376787631 |
| 22 | 2378532739728979 |