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 | 325 |
| 3 | 17577 |
| 4 | 1152501 |
| 5 | 84505509 |
| 6 | 6664647781 |
| 7 | 553268669865 |
| 8 | 47710914870133 |
| 9 | 4236909872278509 |
| 10 | 385139801423145825 |
| 11 | 35681384898462925125 |
| 12 | 3358273513450241419125 |
| 13 | 320308335005997679093125 |
| 14 | 30900030366269721747776325 |
| 15 | 3010365811746267487293617577 |