n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 6 |
4 | 31 |
5 | 171 |
6 | 1018 |
7 | 6320 |
8 | 40407 |
9 | 264494 |
10 | 1763721 |
11 | 11938126 |
12 | 81811270 |
13 | 566505623 |
14 | 3957683000 |
15 | 27860809916 |
16 | 197440008065 |
17 | 1407393565655 |
18 | 10084285158674 |
19 | 72590696159500 |
20 | 524707835158671 |
21 | 3806969433487560 |
22 | 27715036541611090 |
[1,1,1,6,31,171,1018,6320,40407,264494,1763721, 11938126,81811270,566505623,3957683000, 27860809916,197440008065,1407393565655, 10084285158674,72590696159500,524707835158671, 3806969433487560,27715036541611090] |