n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 6 |
3 | 16 |
4 | 37 |
5 | 147 |
6 | 420 |
7 | 2290 |
8 | 7477 |
9 | 50487 |
10 | 200910 |
11 | 1534220 |
12 | 7099871 |
13 | 61765581 |
14 | 301088574 |
15 | 2870376944 |
16 | 15554495573 |
17 | 167142509403 |
18 | 940873745772 |
19 | 11097270672382 |
20 | 66032188454581 |
21 | 807449164097111 |
22 | 5147307668890832 |
[1,3,6,16,37,147,420,2290,7477,50487,200910, 1534220,7099871,61765581,301088574,2870376944, 15554495573,167142509403,940873745772, 11097270672382,66032188454581,807449164097111, 5147307668890832] |