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 | 180 |
| 3 | 416 |
| 4 | 1620 |
| 5 | 3024 |
| 6 | 6404 |
| 7 | 9408 |
| 8 | 18876 |
| 9 | 20048 |
| 10 | 43224 |
| 11 | 45408 |
| 12 | 70462 |
| 13 | 82272 |
| 14 | 138408 |
| 15 | 121600 |
| 16 | 213972 |
| 17 | 210816 |
| 18 | 298620 |
| 19 | 310176 |
| 20 | 472464 |
| 21 | 391376 |
| 22 | 675168 |
| 23 | 604032 |
| 24 | 794524 |
| 25 | 808512 |
| 26 | 1208568 |
| 27 | 949568 |
| 28 | 1533048 |
| 29 | 1361328 |
| 30 | 1781632 |
| 31 | 1719744 |
| 32 | 2435580 |
| 33 | 1916336 |
| 34 | 3092616 |