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 | 0 |
| 1 | 1 |
| 2 | 72 |
| 3 | 1134 |
| 4 | 8320 |
| 5 | 39375 |
| 6 | 140616 |
| 7 | 412972 |
| 8 | 1050624 |
| 9 | 2394765 |
| 10 | 5005000 |
| 11 | 9750906 |
| 12 | 17926272 |
| 13 | 31388539 |
| 14 | 52725960 |
| 15 | 85455000 |
| 16 | 134250496 |
| 17 | 205211097 |
| 18 | 306162504 |
| 19 | 447001030 |
| 20 | 640080000 |
| 21 | 900641511 |
| 22 | 1247296072 |
| 23 | 1702552644 |
| 24 | 2293401600 |