n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 6 |
5 | 10 |
6 | 20 |
7 | 56 |
8 | 168 |
9 | 456 |
10 | 1137 |
11 | 2827 |
12 | 7458 |
13 | 20670 |
14 | 57577 |
15 | 157691 |
16 | 427976 |
17 | 1170552 |
18 | 3248411 |
19 | 9096497 |
20 | 25505562 |
21 | 71436182 |
22 | 200338074 |
23 | 564083786 |
24 | 1595055520 |
25 | 4522769520 |
26 | 12842772295 |
27 | 36514010301 |
28 | 103995490758 |
29 | 296794937626 |
30 | 848620165860 |
31 | 2430089817720 |
[0,0,1,3,6,10,20,56,168,456,1137,2827,7458,20670, 57577,157691,427976,1170552,3248411,9096497, 25505562,71436182,200338074,564083786,1595055520, 4522769520,12842772295,36514010301,103995490758, 296794937626,848620165860,2430089817720] |