n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 10 |
4 | 40 |
5 | 144 |
6 | 490 |
7 | 1610 |
8 | 5168 |
9 | 16320 |
10 | 50930 |
11 | 157546 |
12 | 484120 |
13 | 1480080 |
14 | 4507162 |
15 | 13683050 |
16 | 41439200 |
17 | 125259264 |
18 | 378051170 |
19 | 1139641930 |
20 | 3432176008 |
21 | 10328516880 |
22 | 31062778570 |
23 | 93374780426 |
24 | 280574458640 |
25 | 842810055360 |
26 | 2531053642322 |
27 | 7599494558890 |
28 | 22813774416760 |
29 | 68478238362384 |
[0,0,2,10,40,144,490,1610,5168,16320,50930,157546, 484120,1480080,4507162,13683050,41439200, 125259264,378051170,1139641930,3432176008, 10328516880,31062778570,93374780426,280574458640, 842810055360,2531053642322,7599494558890, 22813774416760,68478238362384] |