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 | 55 |
| 2 | 1650 |
| 3 | 35750 |
| 4 | 625625 |
| 5 | 9384375 |
| 6 | 125125000 |
| 7 | 1519375000 |
| 8 | 17092968750 |
| 9 | 180425781250 |
| 10 | 1804257812500 |
| 11 | 17222460937500 |
| 12 | 157872558593750 |
| 13 | 1396564941406250 |
| 14 | 11970556640625000 |
| 15 | 99754638671875000 |