n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 13 |
5 | 41 |
6 | 136 |
7 | 505 |
8 | 2171 |
9 | 10693 |
10 | 58246 |
11 | 340242 |
12 | 2095435 |
13 | 13492077 |
14 | 90267633 |
15 | 623383765 |
16 | 4414350135 |
17 | 31899350954 |
18 | 235002008725 |
19 | 1773013299342 |
20 | 13855253098226 |
21 | 114135759054965 |
22 | 1010686200326760 |
23 | 9744658443894282 |
24 | 102153128291263124 |
25 | 1147158516520205256 |
[0,0,1,4,13,41,136,505,2171,10693,58246,340242, 2095435,13492077,90267633,623383765,4414350135, 31899350954,235002008725,1773013299342, 13855253098226,114135759054965,1010686200326760, 9744658443894282,102153128291263124, 1147158516520205256] |