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 | 0 |
| 2 | 6 |
| 3 | 0 |
| 4 | 92 |
| 5 | 0 |
| 6 | 2376 |
| 7 | 5504 |
| 8 | 71248 |
| 9 | 253952 |
| 10 | 2175992 |
| 11 | 10140032 |
| 12 | 72393152 |
| 13 | 377186688 |
| 14 | 2462850896 |
| 15 | 13696293888 |
| 16 | 85330361248 |
| 17 | 489397951936 |
| 18 | 2980753350440 |
| 19 | 17385409283712 |
| 20 | 104607950578584 |
| 21 | 615347939509760 |
| 22 | 3679860151206528 |
| 23 | 21744078445007360 |
| 24 | 129606354640045704 |