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 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 1 |
| 9 | 5 |
| 10 | 32 |
| 11 | 385 |
| 12 | 7574 |
| 13 | 181227 |
| 14 | 4624502 |
| 15 | 122090545 |
| 16 | 3328929960 |
| 17 | 93990692632 |
| 18 | 2754222605808 |