n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 5 |
5 | 21 |
6 | 81 |
7 | 295 |
8 | 1037 |
9 | 3555 |
10 | 11961 |
11 | 39667 |
12 | 130049 |
13 | 422403 |
14 | 1361385 |
15 | 4359115 |
16 | 13880129 |
17 | 43984227 |
18 | 138795849 |
19 | 436367131 |
20 | 1367434577 |
21 | 4272615603 |
22 | 13315096089 |
23 | 41397076939 |
24 | 128429930465 |
25 | 397665266595 |
26 | 1229127726825 |
27 | 3792875384251 |
28 | 11686625364785 |
[0,0,0,1,5,21,81,295,1037,3555,11961,39667,130049, 422403,1361385,4359115,13880129,43984227, 138795849,436367131,1367434577,4272615603, 13315096089,41397076939,128429930465,397665266595, 1229127726825,3792875384251,11686625364785] |