n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 2 |
4 | 7 |
5 | 10 |
6 | 23 |
7 | 64 |
8 | 175 |
9 | 400 |
10 | 983 |
11 | 2498 |
12 | 6409 |
13 | 15982 |
14 | 40282 |
15 | 102240 |
16 | 260590 |
17 | 662008 |
18 | 1685764 |
19 | 4301724 |
20 | 10996863 |
21 | 28122246 |
22 | 71995471 |
23 | 184507156 |
24 | 473312401 |
25 | 1215008846 |
26 | 3121272497 |
27 | 8023924572 |
28 | 20640895689 |
29 | 53127720534 |
30 | 136821537884 |
[0,0,2,7,10,23,64,175,400,983,2498,6409,15982, 40282,102240,260590,662008,1685764,4301724, 10996863,28122246,71995471,184507156,473312401, 1215008846,3121272497,8023924572,20640895689, 53127720534,136821537884] |