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 | 64 |
| 2 | 616 |
| 3 | 13752 |
| 4 | 290672 |
| 5 | 6430408 |
| 6 | 136134243 |
| 7 | 2882322121 |
| 8 | 61157844153 |
| 9 | 1301367629704 |
| 10 | 27690052727078 |
| 11 | 588918022178224 |
| 12 | 12522868128178230 |
| 13 | 266292888848973829 |
| 14 | 5662804343794719719 |
| 15 | 120422628814650046372 |