n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 14 |
4 | 47 |
5 | 156 |
6 | 516 |
7 | 1705 |
8 | 5632 |
9 | 18602 |
10 | 61439 |
11 | 202920 |
12 | 670200 |
13 | 2213521 |
14 | 7310764 |
15 | 24145814 |
16 | 79748207 |
17 | 263390436 |
18 | 869919516 |
19 | 2873148985 |
20 | 9489366472 |
21 | 31341248402 |
22 | 103513111679 |
23 | 341880583440 |
24 | 1129154862000 |
25 | 3729345169441 |
26 | 12317190370324 |
[1,4,14,47,156,516,1705,5632,18602,61439,202920, 670200,2213521,7310764,24145814,79748207, 263390436,869919516,2873148985,9489366472, 31341248402,103513111679,341880583440, 1129154862000,3729345169441,12317190370324] |