n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 417 |
3 | 9690 |
4 | 253776 |
5 | 7465176 |
6 | 244906200 |
7 | 8891411760 |
8 | 354610872000 |
9 | 15432114297600 |
10 | 728406536457600 |
11 | 37090538241120000 |
12 | 2027740775284224000 |
13 | 118512161081233920000 |
14 | 7376476698319125196800 |
15 | 487273386402209523916800 |
16 | 34055074238462266429440000 |
[1,20,417,9690,253776,7465176,244906200, 8891411760,354610872000,15432114297600, 728406536457600,37090538241120000, 2027740775284224000,118512161081233920000, 7376476698319125196800,487273386402209523916800, 34055074238462266429440000] |