n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 24 |
5 | 120 |
6 | 720 |
7 | 3720 |
8 | 17304 |
9 | 76110 |
10 | 329462 |
11 | 1441923 |
12 | 6487445 |
13 | 29555588 |
14 | 135025756 |
15 | 615260976 |
16 | 2791161792 |
17 | 12618600768 |
18 | 57008446080 |
19 | 257708989200 |
20 | 1166042944564 |
21 | 5279435858788 |
22 | 23908888017477 |
23 | 108262665958797 |
24 | 490132089640318 |
25 | 2218641353956314 |
[1,1,2,6,24,120,720,3720,17304,76110,329462, 1441923,6487445,29555588,135025756,615260976, 2791161792,12618600768,57008446080,257708989200, 1166042944564,5279435858788,23908888017477, 108262665958797,490132089640318,2218641353956314] |