n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 24 |
6 | 80 |
7 | 239 |
8 | 665 |
9 | 1756 |
10 | 4459 |
11 | 10978 |
12 | 26369 |
13 | 62066 |
14 | 143647 |
15 | 327756 |
16 | 738794 |
17 | 1647917 |
18 | 3642331 |
19 | 7986246 |
20 | 17387367 |
21 | 37618098 |
22 | 80932917 |
23 | 173248897 |
24 | 369190346 |
25 | 783527077 |
26 | 1656712522 |
27 | 3491205863 |
28 | 7334452733 |
29 | 15365201271 |
30 | 32106206735 |
[0,0,1,6,24,80,239,665,1756,4459,10978,26369, 62066,143647,327756,738794,1647917,3642331, 7986246,17387367,37618098,80932917,173248897, 369190346,783527077,1656712522,3491205863, 7334452733,15365201271,32106206735] |