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 | 46 |
| 3 | 2941 |
| 4 | 214486 |
| 5 | 16801306 |
| 6 | 1376657776 |
| 7 | 116346220021 |
| 8 | 10057692309166 |
| 9 | 884572748725086 |
| 10 | 78862377561315156 |
| 11 | 7108473985655908626 |
| 12 | 646575307673212875996 |
| 13 | 59260508917444358016516 |