n | a(n) |
---|---|
1 | 81 |
2 | 310 |
3 | 1186 |
4 | 4700 |
5 | 18612 |
6 | 73176 |
7 | 287924 |
8 | 1136084 |
9 | 4482952 |
10 | 17653056 |
11 | 69546776 |
12 | 274191240 |
13 | 1081253560 |
14 | 4259811632 |
15 | 16788534672 |
16 | 66170693936 |
17 | 260880060656 |
18 | 1027965311952 |
19 | 4051919616000 |
20 | 15968658702496 |
21 | 62951672360256 |
[81,310,1186,4700,18612,73176,287924,1136084, 4482952,17653056,69546776,274191240,1081253560, 4259811632,16788534672,66170693936,260880060656, 1027965311952,4051919616000,15968658702496, 62951672360256] |