n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 36 |
3 | 360 |
4 | 2800 |
5 | 18900 |
6 | 116424 |
7 | 672672 |
8 | 3706560 |
9 | 19691100 |
10 | 101615800 |
11 | 512143632 |
12 | 2531090016 |
13 | 12303909800 |
14 | 58971402000 |
15 | 279211536000 |
16 | 1307950928640 |
17 | 6069709778220 |
18 | 27933266453400 |
19 | 127596402318000 |
20 | 578955421044000 |
21 | 2611088948908440 |
22 | 11711414832065520 |
23 | 52265818258804800 |
[0,2,36,360,2800,18900,116424,672672,3706560, 19691100,101615800,512143632,2531090016, 12303909800,58971402000,279211536000, 1307950928640,6069709778220,27933266453400, 127596402318000,578955421044000,2611088948908440, 11711414832065520,52265818258804800] |