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 | 4 |
| 2 | 9 |
| 3 | 44 |
| 4 | 369 |
| 5 | 2500 |
| 6 | 14329 |
| 7 | 75724 |
| 8 | 386529 |
| 9 | 1946564 |
| 10 | 9755625 |
| 11 | 48813484 |
| 12 | 244119889 |
| 13 | 1220674564 |
| 14 | 6103477209 |
| 15 | 30517527500 |
| 16 | 152587825089 |
| 17 | 762939369604 |
| 18 | 3814697160649 |
| 19 | 19073486197804 |
| 20 | 95367431480625 |