n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 7 |
4 | 21 |
5 | 169 |
6 | 635 |
7 | 3803 |
8 | 19013 |
9 | 115755 |
10 | 642065 |
11 | 4138291 |
12 | 25416351 |
13 | 165975915 |
14 | 1053686983 |
15 | 6884578761 |
16 | 44272817075 |
17 | 290607235917 |
18 | 1898355935879 |
19 | 12584064113799 |
20 | 83219457433335 |
21 | 554858908945825 |
22 | 3692717431924057 |
[1,1,7,21,169,635,3803,19013,115755,642065, 4138291,25416351,165975915,1053686983,6884578761, 44272817075,290607235917,1898355935879, 12584064113799,83219457433335,554858908945825, 3692717431924057] |