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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 128 |
| 9 | 16384 |
| 10 | 33554432 |
| 11 | 1466015678464 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | 53919893334301279589334030174039266539571147379908773492703549718528 |
| 17 | 63657374260452690195888927762793067532858387480466469420624374174610161798791164116074496 |