n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 11 |
4 | 51 |
5 | 281 |
6 | 1808 |
7 | 13333 |
8 | 111041 |
9 | 1031758 |
10 | 10588015 |
11 | 118985914 |
12 | 1453708722 |
13 | 19189390169 |
14 | 272212629009 |
15 | 4130239145929 |
16 | 66751752077187 |
17 | 1144920631189237 |
18 | 20772556460037154 |
19 | 397492611715916267 |
20 | 8000930139415926955 |
[0,1,3,11,51,281,1808,13333,111041,1031758, 10588015,118985914,1453708722,19189390169, 272212629009,4130239145929,66751752077187, 1144920631189237,20772556460037154, 397492611715916267,8000930139415926955] |