n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 284 |
3 | 3520 |
4 | 40656 |
5 | 450240 |
6 | 4851904 |
7 | 51315200 |
8 | 535521536 |
9 | 5534172160 |
10 | 56773377024 |
11 | 579187015680 |
12 | 5883496124416 |
13 | 59567968993280 |
14 | 601543751942144 |
15 | 6062350015528960 |
16 | 60998800124215296 |
17 | 612990400993689600 |
[1,20,284,3520,40656,450240,4851904,51315200, 535521536,5534172160,56773377024,579187015680, 5883496124416,59567968993280,601543751942144, 6062350015528960,60998800124215296, 612990400993689600] |