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 | 2 |
| 2 | 6 |
| 3 | 18 |
| 4 | 40 |
| 5 | 108 |
| 6 | 224 |
| 7 | 480 |
| 8 | 1296 |
| 9 | 2688 |
| 10 | 5760 |
| 11 | 12800 |
| 12 | 31104 |
| 13 | 64512 |
| 14 | 138240 |
| 15 | 286720 |
| 16 | 614400 |
| 17 | 1492992 |
| 18 | 3096576 |
| 19 | 6422528 |