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 | 8 |
| 3 | 39 |
| 4 | 242 |
| 5 | 1895 |
| 6 | 19051 |
| 7 | 246895 |
| 8 | 4145108 |
| 9 | 90325655 |
| 10 | 2555630036 |
| 11 | 93810648902 |
| 12 | 4461086120602 |
| 13 | 274339212258846 |
| 14 | 21775814889230580 |
| 15 | 2226876304576948549 |