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 | 0 |
| 1 | 1 |
| 2 | 65538 |
| 3 | 43046724 |
| 4 | 4295098372 |
| 5 | 152587890630 |
| 6 | 2821196197512 |
| 7 | 33232930569608 |
| 8 | 281483566907400 |
| 9 | 1853020317992013 |
| 10 | 10000305176108940 |
| 11 | 45949729863572172 |
| 12 | 184889914172333328 |
| 13 | 665416609183179854 |
| 14 | 2178019803670969104 |
| 15 | 6568408813691796120 |