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 | 19 |
| 2 | 146 |
| 3 | 905 |
| 4 | 4848 |
| 5 | 23925 |
| 6 | 111085 |
| 7 | 494555 |
| 8 | 2132979 |
| 9 | 8981773 |
| 10 | 37125420 |
| 11 | 151253915 |
| 12 | 609247412 |
| 13 | 2432002859 |
| 14 | 9638730963 |
| 15 | 37983584772 |
| 16 | 149003379789 |
| 17 | 582403346152 |
| 18 | 2269881052166 |
| 19 | 8826625108206 |
| 20 | 34261690527204 |
| 21 | 132805131519232 |