n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 2 |
5 | 6 |
6 | 9 |
7 | 21 |
8 | 45 |
9 | 70 |
10 | 154 |
11 | 322 |
12 | 525 |
13 | 1125 |
14 | 2325 |
15 | 3921 |
16 | 8301 |
17 | 17061 |
18 | 29491 |
19 | 61915 |
20 | 126763 |
21 | 223210 |
22 | 465746 |
23 | 950818 |
24 | 1698453 |
25 | 3527109 |
26 | 7184421 |
27 | 12981421 |
28 | 26855641 |
29 | 54604081 |
30 | 99589963 |
31 | 205390163 |
32 | 416990563 |
33 | 766466053 |
34 | 1576646941 |
[0,0,0,2,6,9,21,45,70,154,322,525,1125,2325,3921, 8301,17061,29491,61915,126763,223210,465746, 950818,1698453,3527109,7184421,12981421,26855641, 54604081,99589963,205390163,416990563,766466053, 1576646941] |