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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 125 |
| 5 | 492 |
| 6 | 16109 |
| 7 | 91750 |
| 8 | 2132689 |
| 9 | 15367128 |
| 10 | 288789625 |
| 11 | 2437001738 |
| 12 | 39817548101 |
| 13 | 374512306500 |
| 14 | 5566947933221 |
| 15 | 56449884952942 |
| 16 | 786500469825625 |
| 17 | 8403437018957232 |
| 18 | 111973430886815089 |
| 19 | 1240762741067455250 |