n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 22 |
3 | 110 |
4 | 562 |
5 | 2854 |
6 | 14514 |
7 | 73782 |
8 | 375106 |
9 | 1906982 |
10 | 9694866 |
11 | 49287446 |
12 | 250571106 |
13 | 1273871494 |
14 | 6476200114 |
15 | 32924174710 |
16 | 167382301826 |
17 | 850950257638 |
18 | 4326122494162 |
19 | 21993454571478 |
20 | 111811915784610 |
21 | 568437508112710 |
[1,4,22,110,562,2854,14514,73782,375106,1906982, 9694866,49287446,250571106,1273871494,6476200114, 32924174710,167382301826,850950257638, 4326122494162,21993454571478,111811915784610, 568437508112710] |