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 | 1 |
| 2 | 51 |
| 3 | 3391 |
| 4 | 261331 |
| 5 | 22069251 |
| 6 | 1985311701 |
| 7 | 187403959401 |
| 8 | 18343212299091 |
| 9 | 1846780916614531 |
| 10 | 190172119451839801 |
| 11 | 19947450199250403501 |
| 12 | 2124709987334672961301 |
| 13 | 229273855680211513815541 |