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 | 3 |
| 2 | 31 |
| 3 | 305 |
| 4 | 3030 |
| 5 | 30373 |
| 6 | 304069 |
| 7 | 3040164 |
| 8 | 30397311 |
| 9 | 303963451 |
| 10 | 3039618610 |
| 11 | 30396311212 |
| 12 | 303963582320 |
| 13 | 3039635808938 |
| 14 | 30396354655186 |
| 15 | 303963549318865 |
| 16 | 3039635507672484 |
| 17 | 30396355081786770 |
| 18 | 303963550903632005 |
| 19 | 3039635509720135531 |
| 20 | 30396355092931863204 |
| 21 | 303963550925315375170 |