n | a(n) |
---|---|
1 | 1 |
2 | 21 |
3 | 145 |
4 | 1122 |
5 | 7886 |
6 | 58446 |
7 | 405196 |
8 | 2865756 |
9 | 19652430 |
10 | 135666717 |
11 | 917861737 |
12 | 6247996468 |
13 | 41874859669 |
14 | 281884085368 |
15 | 1877330322718 |
16 | 12537690094009 |
17 | 83063782595536 |
18 | 551574419251898 |
19 | 3639691674489757 |
20 | 24059481994135080 |
[1,21,145,1122,7886,58446,405196,2865756,19652430, 135666717,917861737,6247996468,41874859669, 281884085368,1877330322718,12537690094009, 83063782595536,551574419251898,3639691674489757, 24059481994135080] |