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 | 53 |
| 3 | 2119 |
| 4 | 148329 |
| 5 | 16019531 |
| 6 | 2467007773 |
| 7 | 513137616783 |
| 8 | 138547156531409 |
| 9 | 47106033220679059 |
| 10 | 19690321886243846661 |
| 11 | 9923922230666898717143 |
| 12 | 5934505493938805432851513 |
| 13 | 4154153845757163802996059099 |