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 | 0 |
| 2 | 1 |
| 3 | 1306449 |
| 4 | 1044000721 |
| 5 | 12957041241 |
| 6 | 1019072079081 |
| 7 | 1174279984164 |
| 8 | 6454272356676 |
| 9 | 65036563475625 |
| 10 | 67624587155889 |
| 11 | 123826990849454025 |
| 12 | 170448128872993657764 |
| 13 | 19198191503444720114404 |