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 | 17 |
| 5 | 81 |
| 6 | 241 |
| 7 | 3361 |
| 8 | 32481 |
| 9 | 183457 |
| 10 | 2534561 |
| 11 | 36903681 |
| 12 | 325995121 |
| 13 | 4808334961 |
| 14 | 90981786897 |
| 15 | 1126128625441 |
| 16 | 18354227120321 |
| 17 | 415821040873281 |
| 18 | 6714588707173441 |
| 19 | 122710186163310337 |
| 20 | 3174234862391072721 |
| 21 | 63597591858999638161 |
| 22 | 1308604168710672673841 |