n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 0 |
7 | 1 |
8 | 2 |
9 | 7 |
10 | 12 |
11 | 31 |
12 | 57 |
13 | 126 |
14 | 232 |
15 | 484 |
16 | 900 |
17 | 1800 |
18 | 3388 |
19 | 6643 |
20 | 12594 |
21 | 24457 |
22 | 46624 |
23 | 90157 |
24 | 172680 |
25 | 333498 |
26 | 641088 |
27 | 1238664 |
28 | 2388357 |
29 | 4620006 |
30 | 8931052 |
[0,0,0,0,0,0,1,2,7,12,31,57,126,232,484,900,1800, 3388,6643,12594,24457,46624,90157,172680,333498, 641088,1238664,2388357,4620006,8931052] |