n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 0 |
4 | 6 |
5 | 6 |
6 | 30 |
7 | 54 |
8 | 158 |
9 | 342 |
10 | 846 |
11 | 1910 |
12 | 4446 |
13 | 10038 |
14 | 22734 |
15 | 50838 |
16 | 113310 |
17 | 250774 |
18 | 552654 |
19 | 1211958 |
20 | 2647390 |
21 | 5760630 |
22 | 12492366 |
23 | 27003990 |
24 | 58202526 |
25 | 125104086 |
26 | 268228430 |
27 | 573739254 |
28 | 1224529758 |
29 | 2608132022 |
30 | 5544352206 |
31 | 11764763670 |
[0,1,0,6,6,30,54,158,342,846,1910,4446,10038, 22734,50838,113310,250774,552654,1211958,2647390, 5760630,12492366,27003990,58202526,125104086, 268228430,573739254,1224529758,2608132022, 5544352206,11764763670] |