n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 3 |
5 | 12 |
6 | 42 |
7 | 156 |
8 | 570 |
9 | 2124 |
10 | 7926 |
11 | 29844 |
12 | 112812 |
13 | 428712 |
14 | 1635108 |
15 | 6259236 |
16 | 24031260 |
17 | 92517180 |
18 | 357019224 |
19 | 1380671532 |
20 | 5349496152 |
21 | 20762603724 |
22 | 80709201504 |
23 | 314178212928 |
24 | 1224576411084 |
25 | 4778651920092 |
26 | 18667769062044 |
[0,0,1,3,12,42,156,570,2124,7926,29844,112812, 428712,1635108,6259236,24031260,92517180, 357019224,1380671532,5349496152,20762603724, 80709201504,314178212928,1224576411084, 4778651920092,18667769062044] |