n | a(n) |
---|---|
2 | 2 |
3 | 6 |
4 | 48 |
5 | 220 |
6 | 1320 |
7 | 6930 |
8 | 39200 |
9 | 215208 |
10 | 1208340 |
11 | 6754440 |
12 | 38076192 |
13 | 214939296 |
14 | 1218641424 |
15 | 6925848930 |
16 | 39477746880 |
17 | 225542306704 |
18 | 1291514481972 |
19 | 7410367503396 |
20 | 42599109627360 |
21 | 245305128355560 |
22 | 1414839151645920 |
23 | 8172376003368720 |
24 | 47270088643265280 |
25 | 273766119948648000 |
[2,6,48,220,1320,6930,39200,215208,1208340, 6754440,38076192,214939296,1218641424,6925848930, 39477746880,225542306704,1291514481972, 7410367503396,42599109627360,245305128355560, 1414839151645920,8172376003368720, 47270088643265280,273766119948648000] |