n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 14 |
3 | 47 |
4 | 156 |
5 | 517 |
6 | 1714 |
7 | 5684 |
8 | 18851 |
9 | 62520 |
10 | 207349 |
11 | 687676 |
12 | 2280686 |
13 | 7563923 |
14 | 25085844 |
15 | 83197513 |
16 | 275925586 |
17 | 915110636 |
18 | 3034975799 |
19 | 10065534960 |
20 | 33382471801 |
21 | 110713382644 |
22 | 367182309614 |
23 | 1217764693607 |
24 | 4038731742156 |
25 | 13394504020957 |
26 | 44423039068114 |
[1,4,14,47,156,517,1714,5684,18851,62520,207349, 687676,2280686,7563923,25085844,83197513, 275925586,915110636,3034975799,10065534960, 33382471801,110713382644,367182309614, 1217764693607,4038731742156,13394504020957, 44423039068114] |