n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 8 |
6 | 22 |
7 | 64 |
8 | 189 |
9 | 577 |
10 | 1788 |
11 | 5642 |
12 | 18016 |
13 | 58213 |
14 | 189792 |
15 | 623913 |
16 | 2065219 |
17 | 6878429 |
18 | 23032917 |
19 | 77500237 |
20 | 261892491 |
21 | 888439320 |
22 | 3024510467 |
23 | 10329241959 |
24 | 35379140285 |
25 | 121502993735 |
26 | 418306868672 |
27 | 1443409882944 |
28 | 4991122973019 |
29 | 17292424070839 |
30 | 60021140494647 |
31 | 208684858267921 |
[0,1,1,3,8,22,64,189,577,1788,5642,18016,58213, 189792,623913,2065219,6878429,23032917,77500237, 261892491,888439320,3024510467,10329241959, 35379140285,121502993735,418306868672, 1443409882944,4991122973019,17292424070839, 60021140494647,208684858267921] |