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 | 2 |
| 4 | 66 |
| 5 | 0 |
| 6 | 0 |
| 7 | 32208 |
| 8 | 130284 |
| 9 | 0 |
| 10 | 0 |
| 11 | 3676662 |
| 12 | 9177368 |
| 13 | 0 |
| 14 | 0 |
| 15 | 95643312 |
| 16 | 188222238 |
| 17 | 0 |
| 18 | 0 |
| 19 | 1143073734 |
| 20 | 1959783480 |
| 21 | 0 |
| 22 | 0 |
| 23 | 8506602000 |
| 24 | 13292902392 |
| 25 | 0 |
| 26 | 0 |
| 27 | 45762314600 |
| 28 | 67073793600 |
| 29 | 0 |
| 30 | 0 |
| 31 | 195390284832 |
| 32 | 272567987604 |
| 33 | 0 |
| 34 | 0 |