n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 20 |
3 | 42 |
4 | 4620 |
5 | 5005 |
6 | 2042040 |
7 | 1763580 |
8 | 59491432 |
9 | 95611230 |
10 | 776363187600 |
11 | 235953517800 |
12 | 24067258815600 |
13 | 143627189706 |
14 | 12170010541088400 |
15 | 34128942604356600 |
16 | 245138783756209200 |
17 | 1103648327722933300 |
18 | 497725329469811592240 |
19 | 94396183175309095080 |
20 | 538372898043179538939600 |
[1,1,20,42,4620,5005,2042040,1763580,59491432, 95611230,776363187600,235953517800,24067258815600, 143627189706,12170010541088400,34128942604356600, 245138783756209200,1103648327722933300, 497725329469811592240,94396183175309095080, 538372898043179538939600] |