n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 4 |
7 | 10 |
8 | 20 |
9 | 60 |
10 | 105 |
11 | 168 |
12 | 364 |
13 | 588 |
14 | 930 |
15 | 2250 |
16 | 3960 |
17 | 6820 |
18 | 17380 |
19 | 30745 |
20 | 52507 |
21 | 126763 |
22 | 219765 |
23 | 372120 |
24 | 898380 |
25 | 1572228 |
26 | 2702252 |
27 | 6619596 |
28 | 11666760 |
29 | 20167170 |
30 | 49146654 |
31 | 86461704 |
32 | 149465844 |
33 | 363087604 |
34 | 639438019 |
[0,0,0,0,0,4,10,20,60,105,168,364,588,930,2250, 3960,6820,17380,30745,52507,126763,219765,372120, 898380,1572228,2702252,6619596,11666760,20167170, 49146654,86461704,149465844,363087604,639438019] |