n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 6 |
4 | 57 |
5 | 750 |
6 | 12645 |
7 | 260190 |
8 | 6322365 |
9 | 177181830 |
10 | 5625873225 |
11 | 199608636150 |
12 | 7826601269025 |
13 | 336070622037150 |
14 | 15684327120386925 |
15 | 790493799998652750 |
16 | 42790196611446409125 |
17 | 2475921578709979149750 |
18 | 152499324058939789556625 |
19 | 9961887269457311273835750 |
20 | 687922376268803482237055625 |
[1,1,6,57,750,12645,260190,6322365,177181830, 5625873225,199608636150,7826601269025, 336070622037150,15684327120386925, 790493799998652750,42790196611446409125, 2475921578709979149750,152499324058939789556625, 9961887269457311273835750, 687922376268803482237055625] |