n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 8 |
4 | 20 |
5 | 53 |
6 | 136 |
7 | 383 |
8 | 1067 |
9 | 3292 |
10 | 10162 |
11 | 34586 |
12 | 118332 |
13 | 441898 |
14 | 1660947 |
15 | 6745710 |
16 | 27575425 |
17 | 120801230 |
18 | 532530170 |
19 | 2499230441 |
20 | 11800052796 |
21 | 58992236094 |
22 | 296630364605 |
23 | 1572128197439 |
24 | 8378539879636 |
25 | 46882666240016 |
26 | 263735138346443 |
27 | 1552510947814406 |
[0,1,3,8,20,53,136,383,1067,3292,10162,34586, 118332,441898,1660947,6745710,27575425,120801230, 532530170,2499230441,11800052796,58992236094, 296630364605,1572128197439,8378539879636, 46882666240016,263735138346443,1552510947814406] |