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 | 1 |
| 3 | 1 |
| 4 | 0 |
| 5 | 19 |
| 6 | 0 |
| 7 | 41 |
| 8 | 110 |
| 9 | 70 |
| 10 | 13696 |
| 11 | 1 |
| 12 | 44796 |
| 13 | 155 |
| 14 | 411064 |
| 15 | 2122802 |
| 16 | 251746 |
| 17 | 1057634441 |
| 18 | 4404368 |
| 19 | 25043183 |
| 20 | 44848672 |
| 21 | 19725545894 |
| 22 | 106293316 |
| 23 | 307873058001 |
| 24 | 50194102 |
| 25 | 8305023165502 |
| 26 | 65808841818130 |
| 27 | 33715371370134 |
| 28 | 115625740201672616 |
| 29 | 78940089764191 |