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 | 41 |
| 3 | 1041 |
| 4 | 22193 |
| 5 | 433801 |
| 6 | 8057625 |
| 7 | 144762849 |
| 8 | 2540882465 |
| 9 | 43840779353 |
| 10 | 746649798473 |
| 11 | 12587443678705 |
| 12 | 210491254232465 |
| 13 | 3496816762316713 |
| 14 | 57778098654714361 |
| 15 | 950391251581267073 |
| 16 | 15574198350636963201 |
| 17 | 254405750326548970361 |
| 18 | 4144508602760970898729 |
| 19 | 67361936661916258817937 |