n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 40 |
4 | 672 |
5 | 16128 |
6 | 506880 |
7 | 19768320 |
8 | 922521600 |
9 | 50185175040 |
10 | 3120605429760 |
11 | 218442380083200 |
12 | 17004899126476800 |
13 | 1457562782269440000 |
14 | 136427876420419584000 |
15 | 13847429456672587776000 |
[1,1,4,40,672,16128,506880,19768320,922521600, 50185175040,3120605429760,218442380083200, 17004899126476800,1457562782269440000, 136427876420419584000,13847429456672587776000] |