n | a(n) |
---|---|
-1 | 1 |
0 | 2 |
1 | 5 |
2 | 20 |
3 | 130 |
4 | 1120 |
5 | 12080 |
6 | 156320 |
7 | 2360080 |
8 | 40721920 |
9 | 790465280 |
10 | 17048837120 |
11 | 404482209280 |
12 | 10468697374720 |
13 | 293526944276480 |
14 | 8863147657809920 |
15 | 286741939970836480 |
16 | 9895168120066539520 |
17 | 362814031120908615680 |
18 | 14085379571459949854720 |
19 | 577210378447729271111680 |
[1,2,5,20,130,1120,12080,156320,2360080,40721920, 790465280,17048837120,404482209280,10468697374720, 293526944276480,8863147657809920, 286741939970836480,9895168120066539520, 362814031120908615680,14085379571459949854720, 577210378447729271111680] |