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 | 0 |
| 2 | 56 |
| 3 | 810 |
| 4 | 4992 |
| 5 | 20000 |
| 6 | 61560 |
| 7 | 158466 |
| 8 | 358400 |
| 9 | 734832 |
| 10 | 1395000 |
| 11 | 2488970 |
| 12 | 4219776 |
| 13 | 6854640 |
| 14 | 10737272 |
| 15 | 16301250 |
| 16 | 24084480 |
| 17 | 34744736 |
| 18 | 49076280 |
| 19 | 68027562 |
| 20 | 92720000 |
| 21 | 124467840 |
| 22 | 164799096 |
| 23 | 215477570 |
| 24 | 278525952 |
| 25 | 356250000 |
| 26 | 451263800 |
| 27 | 566516106 |
| 28 | 705317760 |