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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 29 |
| 4 | 61 |
| 5 | 9049 |
| 6 | 53 |
| 7 | 7829 |
| 8 | 3046721 |
| 9 | 89 |
| 10 | 84401 |
| 11 | 1381 |
| 12 | 2429536481 |
| 13 | 8329 |
| 14 | 876792454961 |
| 15 | 113209 |
| 16 | 853020188851 |
| 17 | 77181699666569 |
| 18 | 15009463529 |
| 19 | 35085171767 |
| 20 | 2157665459056928801 |
| 21 | 1094189891315123 |
| 22 | 984770902183 |