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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 61 |
| 6 | 361 |
| 7 | 1261 |
| 8 | 3361 |
| 9 | 68041 |
| 10 | 1073521 |
| 11 | 8343721 |
| 12 | 43290721 |
| 13 | 432509221 |
| 14 | 11472541081 |
| 15 | 165124339381 |
| 16 | 1457296102081 |
| 17 | 12237047593681 |
| 18 | 322364521392481 |
| 19 | 7462073325643921 |
| 20 | 103362225413048641 |
| 21 | 1051987428484484941 |
| 22 | 21127644716862970441 |