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 | 4 |
| 3 | 27 |
| 4 | 250 |
| 5 | 2975 |
| 6 | 43296 |
| 7 | 744913 |
| 8 | 14797036 |
| 9 | 333393345 |
| 10 | 8403026320 |
| 11 | 234300271811 |
| 12 | 7161316358616 |
| 13 | 238108166195263 |
| 14 | 8556626831402560 |
| 15 | 330494399041444425 |
| 16 | 13654219915946513296 |
| 17 | 600870384794864432897 |
| 18 | 28060233470995898505024 |
| 19 | 1386000542545570348128235 |