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 | 0 |
| 2 | 0 |
| 3 | 155 |
| 4 | 1085 |
| 5 | 5208 |
| 6 | 22568 |
| 7 | 82615 |
| 8 | 247845 |
| 9 | 628680 |
| 10 | 1383096 |
| 11 | 2648919 |
| 12 | 4414865 |
| 13 | 6440560 |
| 14 | 8280720 |
| 15 | 9398115 |
| 16 | 9398115 |
| 17 | 8280720 |
| 18 | 6440560 |
| 19 | 4414865 |
| 20 | 2648919 |
| 21 | 1383096 |
| 22 | 628680 |
| 23 | 247845 |
| 24 | 82615 |
| 25 | 22568 |
| 26 | 5208 |
| 27 | 1085 |
| 28 | 155 |
| 29 | 0 |
| 30 | 0 |
| 31 | 1 |