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 | 2 |
| 4 | 0 |
| 5 | 3 |
| 6 | 0 |
| 7 | 12 |
| 8 | 0 |
| 9 | 8 |
| 10 | 0 |
| 11 | 47 |
| 12 | 0 |
| 13 | 106 |
| 14 | 0 |
| 15 | 280 |
| 16 | 0 |
| 17 | 720 |
| 18 | 0 |
| 19 | 1825 |
| 20 | 0 |
| 21 | 5107 |
| 22 | 0 |
| 23 | 14072 |
| 24 | 0 |
| 25 | 38606 |
| 26 | 0 |
| 27 | 107852 |
| 28 | 0 |
| 29 | 301048 |
| 30 | 0 |
| 31 | 852975 |
| 32 | 0 |
| 33 | 2369097 |
| 34 | 0 |
| 35 | 6699177 |
| 36 | 0 |
| 37 | 19111621 |
| 38 | 0 |
| 39 | 54510099 |
| 40 | 0 |
| 41 | 155404674 |
| 42 | 0 |