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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 2 |
| 7 | 32 |
| 8 | 322 |
| 9 | 2634 |
| 10 | 19216 |
| 11 | 130662 |
| 12 | 848284 |
| 13 | 5334332 |
| 14 | 32788726 |
| 15 | 198201268 |
| 16 | 1183152686 |
| 17 | 6995479542 |
| 18 | 41055940756 |
| 19 | 239560353258 |
| 20 | 1391435203864 |
| 21 | 8052418072728 |
| 22 | 46464481278410 |
| 23 | 267483032264168 |
| 24 | 1536914425518970 |
| 25 | 8817393642571330 |