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 | 36 |
| 3 | 576 |
| 4 | 64 |
| 5 | 900 |
| 6 | 4235364 |
| 7 | 112896 |
| 8 | 4064256 |
| 9 | 2624400 |
| 10 | 1 |
| 11 | 900 |
| 12 | 9437184 |
| 13 | 1285956 |
| 14 | 45158400 |
| 15 | 1093955625 |
| 16 | 45158400 |
| 17 | 101606400 |
| 18 | 19110297600 |
| 19 | 740710656 |
| 20 | 36 |
| 21 | 16384 |
| 22 | 7290000 |
| 23 | 241864704 |
| 24 | 1316818944 |
| 25 | 12859560000 |
| 26 | 65028096 |
| 27 | 585252864 |
| 28 | 4064256 |
| 29 | 129600 |
| 30 | 576 |
| 31 | 74649600 |