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 | 82 |
| 3 | 5379 |
| 4 | 148648 |
| 5 | 2085655 |
| 6 | 18356514 |
| 7 | 116081245 |
| 8 | 574795936 |
| 9 | 2359033605 |
| 10 | 8345970370 |
| 11 | 26180606287 |
| 12 | 74354990568 |
| 13 | 194253329803 |
| 14 | 472634761522 |
| 15 | 1081541381145 |
| 16 | 2346163937920 |
| 17 | 4856060529001 |
| 18 | 9641643580530 |
| 19 | 18446420258299 |
| 20 | 34136541925480 |
| 21 | 61303301959263 |