n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 9 |
3 | 50 |
4 | 314 |
5 | 2116 |
6 | 14949 |
7 | 109246 |
8 | 818978 |
9 | 6263072 |
10 | 48668366 |
11 | 383182648 |
12 | 3050196328 |
13 | 24506969724 |
14 | 198482172753 |
15 | 1618700191002 |
16 | 13281652367078 |
17 | 109564878995724 |
18 | 908171084052990 |
19 | 7560049450347964 |
20 | 63176859344766204 |
[1,2,9,50,314,2116,14949,109246,818978,6263072, 48668366,383182648,3050196328,24506969724, 198482172753,1618700191002,13281652367078, 109564878995724,908171084052990,7560049450347964, 63176859344766204] |