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 | 5 |
| 3 | 11 |
| 4 | 29 |
| 5 | 419 |
| 6 | 1429 |
| 7 | 1429 |
| 8 | 315589 |
| 9 | 1729001 |
| 10 | 57762431 |
| 11 | 1724478911 |
| 12 | 6188402219 |
| 13 | 349152569039 |
| 14 | 1430083494841 |
| 15 | 390499187164241 |
| 16 | 1010518715554349 |
| 17 | 18628320726623609 |
| 18 | 522124211958421799 |
| 19 | 522124211958421799 |
| 20 | 5936798290039408015951 |
| 21 | 311263131154464891496249 |