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 | 3 |
| 4 | 7 |
| 5 | 11 |
| 6 | 491 |
| 7 | 6381 |
| 8 | 10940111 |
| 9 | 1225586965 |
| 10 | 130025302505741 |
| 11 | 252282619993126717 |
| 12 | 2209617218725712597768722 |
| 13 | 98758655816833782283724345637 |