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 | 13 |
| 2 | 377 |
| 3 | 16211 |
| 4 | 761917 |
| 5 | 55619941 |
| 6 | 4393975339 |
| 7 | 443791509239 |
| 8 | 50148440544007 |
| 9 | 6870336354528959 |
| 10 | 954976753279525301 |
| 11 | 142291536238649269849 |
| 12 | 23193520406899830985387 |
| 13 | 3873317907952271774559629 |
| 14 | 701070541339361191195292849 |
| 15 | 139513037726532877047863276951 |