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 | 3 |
| 2 | 3 |
| 3 | 11 |
| 4 | 41 |
| 5 | 101 |
| 6 | 251 |
| 7 | 271 |
| 8 | 3541 |
| 9 | 5051 |
| 10 | 9091 |
| 11 | 21401 |
| 12 | 25601 |
| 13 | 27961 |
| 14 | 60101 |
| 15 | 7019801 |
| 16 | 182521213001 |
| 17 | 14103673319201 |
| 18 | 78875943472201 |
| 19 | 1680588011350901 |