n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 6 |
3 | 22 |
4 | 68 |
5 | 190 |
6 | 500 |
7 | 1260 |
8 | 3080 |
9 | 7350 |
10 | 17220 |
11 | 39732 |
12 | 90552 |
13 | 204204 |
14 | 456456 |
15 | 1012440 |
16 | 2230800 |
17 | 4886310 |
18 | 10647780 |
19 | 23094500 |
20 | 49884120 |
21 | 107343236 |
22 | 230205976 |
23 | 492156392 |
24 | 1049212528 |
25 | 2230928700 |
26 | 4732273000 |
27 | 10015777800 |
28 | 21154820400 |
29 | 44596287000 |
30 | 93846099600 |
[0,1,6,22,68,190,500,1260,3080,7350,17220,39732, 90552,204204,456456,1012440,2230800,4886310, 10647780,23094500,49884120,107343236,230205976, 492156392,1049212528,2230928700,4732273000, 10015777800,21154820400,44596287000,93846099600] |