n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 12 |
5 | 41 |
6 | 158 |
7 | 663 |
8 | 2944 |
9 | 13537 |
10 | 63551 |
11 | 301968 |
12 | 1444795 |
13 | 6940099 |
14 | 33411718 |
15 | 161058633 |
16 | 776930015 |
17 | 3749357128 |
18 | 18098055047 |
19 | 87370273487 |
20 | 421820387606 |
21 | 2036618058597 |
22 | 9833358788859 |
23 | 47478828272736 |
24 | 229245800095323 |
[1,2,4,12,41,158,663,2944,13537,63551,301968, 1444795,6940099,33411718,161058633,776930015, 3749357128,18098055047,87370273487,421820387606, 2036618058597,9833358788859,47478828272736, 229245800095323] |