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 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 26 |
| 16 | 0 |
| 17 | 262 |
| 18 | 0 |
| 19 | 10226 |
| 20 | 43964 |
| 21 | 139484 |
| 22 | 0 |
| 23 | 13936472 |
| 24 | 59652396 |
| 25 | 301235944 |
| 26 | 1915640632 |
| 27 | 7969506364 |
| 28 | 0 |