n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 6 |
4 | 18 |
5 | 50 |
6 | 120 |
7 | 273 |
8 | 588 |
9 | 1224 |
10 | 2475 |
11 | 4895 |
12 | 9504 |
13 | 18174 |
14 | 34307 |
15 | 64050 |
16 | 118440 |
17 | 217192 |
18 | 395352 |
19 | 714951 |
20 | 1285350 |
21 | 2298660 |
22 | 4091241 |
23 | 7250221 |
24 | 12797568 |
25 | 22507500 |
26 | 39452725 |
27 | 68942718 |
28 | 120132558 |
29 | 208776974 |
30 | 361937400 |
31 | 626015085 |
32 | 1080441264 |
[0,0,1,6,18,50,120,273,588,1224,2475,4895,9504, 18174,34307,64050,118440,217192,395352,714951, 1285350,2298660,4091241,7250221,12797568,22507500, 39452725,68942718,120132558,208776974,361937400, 626015085,1080441264] |