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 | 0 |
| 2 | 2 |
| 3 | 1 |
| 4 | 3 |
| 5 | 7 |
| 6 | 0 |
| 7 | 29 |
| 8 | 27 |
| 9 | 0 |
| 10 | 90 |
| 11 | 234 |
| 12 | 0 |
| 13 | 753 |
| 14 | 1025 |
| 15 | 0 |
| 16 | 3876 |
| 17 | 9242 |
| 18 | 0 |
| 19 | 32549 |
| 20 | 50112 |
| 21 | 0 |
| 22 | 180092 |
| 23 | 420318 |
| 24 | 0 |
| 25 | 1525141 |
| 26 | 2467286 |
| 27 | 0 |
| 28 | 9248093 |
| 29 | 20668960 |
| 30 | 0 |
| 31 | 76318859 |
| 32 | 130130794 |
| 33 | 0 |
| 34 | 487397935 |
| 35 | 1066434006 |
| 36 | 0 |