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 | 16 |
| 3 | 0 |
| 4 | 596 |
| 5 | 0 |
| 6 | 24366 |
| 7 | 0 |
| 8 | 1001855 |
| 9 | 0 |
| 10 | 41171316 |
| 11 | 0 |
| 12 | 1691327788 |
| 13 | 0 |
| 14 | 69470653170 |
| 15 | 0 |
| 16 | 2853337539621 |
| 17 | 0 |
| 18 | 117191717993760 |
| 19 | 0 |
| 20 | 4813242705044572 |
| 21 | 0 |
| 22 | 197686734633818238 |
| 23 | 0 |
| 24 | 8119268451165592095 |
| 25 | 0 |