n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 15 |
4 | 143 |
5 | 1552 |
6 | 18282 |
7 | 228174 |
8 | 2976534 |
9 | 40256580 |
10 | 561755676 |
11 | 8066942027 |
12 | 119104886610 |
13 | 1809118800204 |
14 | 28327453520403 |
15 | 458854209551159 |
16 | 7727223037965079 |
17 | 136130623466875012 |
18 | 2526349854311842166 |
19 | 49724570281877830993 |
20 | 1043539871136604436514 |
21 | 23417606258398828845811 |
[1,1,2,15,143,1552,18282,228174,2976534,40256580, 561755676,8066942027,119104886610,1809118800204, 28327453520403,458854209551159,7727223037965079, 136130623466875012,2526349854311842166, 49724570281877830993,1043539871136604436514, 23417606258398828845811] |