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 | 15 |
| 3 | 735 |
| 4 | 76545 |
| 5 | 13835745 |
| 6 | 3859590735 |
| 7 | 1539272109375 |
| 8 | 831766748637825 |
| 9 | 585243816844111425 |
| 10 | 520038240188935042575 |
| 11 | 569585968715180280038175 |
| 12 | 753960950911045074462890625 |
| 13 | 1186626209895384011075327630625 |
| 14 | 2190213762744801162239116550679375 |