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 | 8 |
| 4 | 82 |
| 5 | 512 |
| 6 | 2644 |
| 7 | 12364 |
| 8 | 54598 |
| 9 | 232772 |
| 10 | 970520 |
| 11 | 3988624 |
| 12 | 16239066 |
| 13 | 65709256 |
| 14 | 264814140 |
| 15 | 1064414100 |
| 16 | 4271035662 |
| 17 | 17118683020 |
| 18 | 68563527616 |
| 19 | 274481537112 |
| 20 | 1098506723042 |
| 21 | 4395504614544 |
| 22 | 17585769696164 |
| 23 | 70352578566620 |
| 24 | 281434319454038 |
| 25 | 1125797816327892 |