n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 12 |
4 | 50 |
5 | 280 |
6 | 1442 |
7 | 7812 |
8 | 42338 |
9 | 232176 |
10 | 1280642 |
11 | 7103932 |
12 | 39579410 |
13 | 221340808 |
14 | 1241708834 |
15 | 6984796852 |
16 | 39382895810 |
17 | 222512915680 |
18 | 1259482604546 |
19 | 7140546372204 |
20 | 40541480041970 |
21 | 230480474747640 |
22 | 1311841695315362 |
23 | 7474722997813732 |
24 | 42631911134818850 |
[1,0,2,12,50,280,1442,7812,42338,232176,1280642, 7103932,39579410,221340808,1241708834,6984796852, 39382895810,222512915680,1259482604546, 7140546372204,40541480041970,230480474747640, 1311841695315362,7474722997813732, 42631911134818850] |