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 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 16 |
| 5 | 100 |
| 6 | 676 |
| 7 | 4913 |
| 8 | 40000 |
| 9 | 362404 |
| 10 | 3625216 |
| 11 | 39904489 |
| 12 | 478996996 |
| 13 | 6226945921 |
| 14 | 87177877081 |
| 15 | 1307672296225 |
| 16 | 20922784184449 |
| 17 | 355687416544329 |
| 18 | 6402373660047556 |
| 19 | 121645099966283776 |
| 20 | 2432902006216007824 |