n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 2 |
5 | 7 |
6 | 20 |
7 | 49 |
8 | 132 |
9 | 330 |
10 | 786 |
11 | 1892 |
12 | 4472 |
13 | 10368 |
14 | 23940 |
15 | 54720 |
16 | 123836 |
17 | 278664 |
18 | 622896 |
19 | 1383672 |
20 | 3058720 |
21 | 6729184 |
22 | 14738688 |
23 | 32157312 |
24 | 69907200 |
25 | 151461952 |
26 | 327158208 |
27 | 704648448 |
28 | 1513680192 |
29 | 3243601280 |
30 | 6934595840 |
31 | 14793782400 |
32 | 31496441856 |
33 | 66929938944 |
[0,0,0,1,2,7,20,49,132,330,786,1892,4472,10368, 23940,54720,123836,278664,622896,1383672,3058720, 6729184,14738688,32157312,69907200,151461952, 327158208,704648448,1513680192,3243601280, 6934595840,14793782400,31496441856,66929938944] |