n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 9 |
4 | 39 |
5 | 195 |
6 | 1185 |
7 | 8295 |
8 | 66465 |
9 | 598185 |
10 | 5982795 |
11 | 65810745 |
12 | 789739335 |
13 | 10266611355 |
14 | 143732694105 |
15 | 2155990411575 |
16 | 34495848612225 |
17 | 586429426407825 |
18 | 10555729709800275 |
19 | 200558864486205225 |
20 | 4011177290378833575 |
[1,1,3,9,39,195,1185,8295,66465,598185,5982795, 65810745,789739335,10266611355,143732694105, 2155990411575,34495848612225,586429426407825, 10555729709800275,200558864486205225, 4011177290378833575] |