n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 3 |
6 | 8 |
7 | 18 |
8 | 49 |
9 | 120 |
10 | 313 |
11 | 802 |
12 | 2120 |
13 | 5591 |
14 | 14942 |
15 | 40033 |
16 | 108108 |
17 | 293094 |
18 | 798839 |
19 | 2185341 |
20 | 6002085 |
21 | 16538599 |
22 | 45716952 |
23 | 126727195 |
24 | 352215812 |
25 | 981268481 |
26 | 2739930091 |
27 | 7666333161 |
28 | 21491833976 |
29 | 60358490615 |
30 | 169798048026 |
31 | 478420333601 |
[0,1,1,2,3,8,18,49,120,313,802,2120,5591,14942, 40033,108108,293094,798839,2185341,6002085, 16538599,45716952,126727195,352215812,981268481, 2739930091,7666333161,21491833976,60358490615, 169798048026,478420333601] |