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 | 0 |
| 3 | 6 |
| 4 | 28 |
| 5 | 0 |
| 6 | 496 |
| 7 | 0 |
| 8 | 8128 |
| 9 | 2016 |
| 10 | 0 |
| 11 | 130816 |
| 12 | 0 |
| 13 | 2096128 |
| 14 | 33550336 |
| 15 | 0 |
| 16 | 0 |
| 17 | 134209536 |
| 18 | 8589869056 |
| 19 | 0 |
| 20 | 137438691328 |
| 21 | 0 |
| 22 | 0 |
| 23 | 0 |
| 24 | 34359607296 |
| 25 | 35184367894528 |
| 26 | 8796090925056 |
| 27 | 0 |
| 28 | 562949936644096 |
| 29 | 2251799780130816 |
| 30 | 9007199187632128 |
| 31 | 140737479966720 |
| 32 | 2305843008139952128 |
| 33 | 0 |