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 | 490 |
| 4 | 4998 |
| 5 | 45864 |
| 6 | 464422 |
| 7 | 3429426 |
| 8 | 21668094 |
| 9 | 111678742 |
| 10 | 492567012 |
| 11 | 1876801038 |
| 12 | 6352945942 |
| 13 | 19484903508 |
| 14 | 54935857326 |
| 15 | 144330551050 |