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 | 24 |
| 2 | 1151 |
| 3 | 55224 |
| 4 | 2649601 |
| 5 | 127125624 |
| 6 | 6099380351 |
| 7 | 292643131224 |
| 8 | 14040770918401 |
| 9 | 673664360952024 |
| 10 | 32321848554778751 |
| 11 | 1550775066268428024 |
| 12 | 74404881332329766401 |
| 13 | 3569883528885560359224 |
| 14 | 171280004505174567476351 |
| 15 | 8217870332719493678505624 |