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 | 2 |
| 2 | 15 |
| 3 | 316 |
| 4 | 26537 |
| 5 | 6605334 |
| 6 | 6616438915 |
| 7 | 19736647911152 |
| 8 | 237118435525391709 |
| 9 | 8486871559326397146058 |
| 10 | 1223496018226895154470801975 |
| 11 | 525487164444668938421129856286884 |
| 12 | 909068834019126312744002601418684280593 |