n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 9 |
6 | 28 |
7 | 81 |
8 | 232 |
9 | 673 |
10 | 1944 |
11 | 5617 |
12 | 16236 |
13 | 46921 |
14 | 135604 |
15 | 391905 |
16 | 1132624 |
17 | 3273345 |
18 | 9460144 |
19 | 27340321 |
20 | 79014996 |
21 | 228357577 |
22 | 659965644 |
23 | 1907336113 |
24 | 5512303672 |
25 | 15930853281 |
26 | 46041020488 |
27 | 133061018769 |
28 | 384553481404 |
29 | 1111380188041 |
[0,1,0,1,4,9,28,81,232,673,1944,5617,16236,46921, 135604,391905,1132624,3273345,9460144,27340321, 79014996,228357577,659965644,1907336113, 5512303672,15930853281,46041020488,133061018769, 384553481404,1111380188041] |