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 | 1 |
| 2 | 128 |
| 3 | 4320 |
| 4 | 32768 |
| 5 | 312000 |
| 6 | 552960 |
| 7 | 4939200 |
| 8 | 8388608 |
| 9 | 28343520 |
| 10 | 39936000 |
| 11 | 194858400 |
| 12 | 141557760 |
| 13 | 752955840 |
| 14 | 632217600 |
| 15 | 1347840000 |
| 16 | 2147483648 |
| 17 | 6565340160 |
| 18 | 3627970560 |
| 19 | 16089567840 |
| 20 | 10223616000 |
| 21 | 21337344000 |
| 22 | 24941875200 |
| 23 | 74905892160 |
| 24 | 36238786560 |
| 25 | 121875000000 |
| 26 | 96378347520 |