n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 57 |
5 | 340 |
6 | 2305 |
7 | 18186 |
8 | 158977 |
9 | 1560840 |
10 | 16695553 |
11 | 196272142 |
12 | 2483596577 |
13 | 34036624700 |
14 | 497515462561 |
15 | 7792454528002 |
16 | 129248702613505 |
17 | 2278494692749840 |
18 | 42291311707716609 |
19 | 828953188249846678 |
[1,1,3,12,57,340,2305,18186,158977,1560840, 16695553,196272142,2483596577,34036624700, 497515462561,7792454528002,129248702613505, 2278494692749840,42291311707716609, 828953188249846678] |