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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 60 |
| 6 | 208 |
| 7 | 1184 |
| 8 | 7840 |
| 9 | 36036 |
| 10 | 209664 |
| 11 | 1395480 |
| 12 | 10996728 |
| 13 | 83573220 |
| 14 | 723835856 |
| 15 | 7132494776 |
| 16 | 77976981216 |
| 17 | 790552134804 |