n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 8 |
3 | 21 |
4 | 56 |
5 | 145 |
6 | 366 |
7 | 945 |
8 | 2506 |
9 | 6633 |
10 | 17776 |
11 | 48521 |
12 | 133106 |
13 | 369019 |
14 | 1028404 |
15 | 2880287 |
16 | 8100948 |
17 | 22877145 |
18 | 64823568 |
19 | 184274931 |
20 | 525282740 |
21 | 1501215193 |
22 | 4299836186 |
23 | 12340952049 |
24 | 35486796312 |
25 | 102220582465 |
26 | 294917666854 |
27 | 852123981581 |
28 | 2465458792768 |
[0,3,8,21,56,145,366,945,2506,6633,17776,48521, 133106,369019,1028404,2880287,8100948,22877145, 64823568,184274931,525282740,1501215193, 4299836186,12340952049,35486796312,102220582465, 294917666854,852123981581,2465458792768] |