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 | 3 |
| 2 | 24 |
| 3 | 240 |
| 4 | 1008 |
| 5 | 6600 |
| 6 | 13104 |
| 7 | 39168 |
| 8 | 61560 |
| 9 | 133584 |
| 10 | 341040 |
| 11 | 446400 |
| 12 | 911088 |
| 13 | 1377600 |
| 14 | 1668744 |
| 15 | 2386848 |
| 16 | 3869424 |
| 17 | 5954280 |
| 18 | 6807600 |
| 19 | 9922968 |
| 20 | 12524400 |
| 21 | 14001984 |
| 22 | 19225440 |
| 23 | 23439864 |
| 24 | 31014720 |
| 25 | 43803648 |
| 26 | 51510000 |
| 27 | 55723824 |
| 28 | 64921608 |
| 29 | 69925680 |
| 30 | 80795904 |
| 31 | 129040128 |