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 | 36 |
| 2 | 400 |
| 3 | 3136 |
| 4 | 20736 |
| 5 | 123904 |
| 6 | 692224 |
| 7 | 3686400 |
| 8 | 18939904 |
| 9 | 94633984 |
| 10 | 462422016 |
| 11 | 2218786816 |
| 12 | 10485760000 |
| 13 | 48922361856 |
| 14 | 225754218496 |
| 15 | 1031865892864 |
| 16 | 4677219385344 |
| 17 | 21045339750400 |
| 18 | 94076963651584 |
| 19 | 418089296461824 |