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 | 9 |
| 2 | 271 |
| 3 | 11193 |
| 4 | 535251 |
| 5 | 27854739 |
| 6 | 1531656211 |
| 7 | 87547358649 |
| 8 | 5149886133907 |
| 9 | 309721191497259 |
| 10 | 18957806551405701 |
| 11 | 1177134132932168739 |
| 12 | 73964787438524189871 |
| 13 | 4694347514292389411103 |
| 14 | 300499277330710307643771 |
| 15 | 19378727805024033594228153 |
| 16 | 1257802636907811605342461587 |