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 | 6 |
| 2 | 12 |
| 3 | 54 |
| 4 | 96 |
| 5 | 390 |
| 6 | 684 |
| 7 | 2742 |
| 8 | 4800 |
| 9 | 19206 |
| 10 | 33612 |
| 11 | 134454 |
| 12 | 235296 |
| 13 | 941190 |
| 14 | 1647084 |
| 15 | 6588342 |
| 16 | 11529600 |
| 17 | 46118406 |
| 18 | 80707212 |
| 19 | 322828854 |
| 20 | 564950496 |
| 21 | 2259801990 |
| 22 | 3954653484 |
| 23 | 15818613942 |
| 24 | 27682574400 |
| 25 | 110730297606 |
| 26 | 193778020812 |
| 27 | 775112083254 |
| 28 | 1356446145696 |