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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 9 |
| 7 | 88193 |
| 8 | 113314233813 |
| 9 | 281341168330848874 |
| 10 | 1251392240942040452186674 |
| 11 | 9854603833337765095207342173991 |
| 12 | 134283276101750327256393048776114352985 |