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 | 5 |
| 2 | 63 |
| 3 | 1287 |
| 4 | 36465 |
| 5 | 1322685 |
| 6 | 58503375 |
| 7 | 3053876175 |
| 8 | 183771489825 |
| 9 | 12525477859125 |
| 10 | 953725671273375 |
| 11 | 80237355387564375 |
| 12 | 7391465178302430225 |
| 13 | 739967791738943292525 |
| 14 | 79993069900054731795375 |
| 15 | 9286937373235386442953375 |
| 16 | 1152424501315118408602850625 |