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 | 4 |
| 3 | 1 |
| 4 | 144 |
| 5 | 361 |
| 6 | 484 |
| 7 | 19321 |
| 8 | 28224 |
| 9 | 128881 |
| 10 | 2427364 |
| 11 | 1745041 |
| 12 | 26501904 |
| 13 | 285643801 |
| 14 | 64995844 |
| 15 | 4675961161 |
| 16 | 31354493184 |
| 17 | 149793121 |
| 18 | 741117817924 |
| 19 | 3178942795681 |
| 20 | 545370434064 |
| 21 | 107989070784841 |
| 22 | 292105630845604 |