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 | 1 |
| 2 | 9 |
| 3 | 211 |
| 4 | 9285 |
| 5 | 658171 |
| 6 | 68504709 |
| 7 | 9837380491 |
| 8 | 1863598406805 |
| 9 | 450247033371451 |
| 10 | 135111441590583909 |
| 11 | 49300373690091496171 |
| 12 | 21495577955682021043125 |
| 13 | 11037123350952586270549531 |
| 14 | 6591700149366720366704735109 |