n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 18 |
4 | 58 |
5 | 190 |
6 | 642 |
7 | 2206 |
8 | 7746 |
9 | 27662 |
10 | 100738 |
11 | 373550 |
12 | 1413506 |
13 | 5457710 |
14 | 21546466 |
15 | 87025806 |
16 | 360264258 |
17 | 1529624366 |
18 | 6669850466 |
19 | 29877013902 |
20 | 137560725890 |
21 | 650780790894 |
22 | 3162711095074 |
23 | 15774862353614 |
24 | 80687636530882 |
25 | 422713072650286 |
26 | 2265833731786594 |
[1,2,6,18,58,190,642,2206,7746,27662,100738, 373550,1413506,5457710,21546466,87025806, 360264258,1529624366,6669850466,29877013902, 137560725890,650780790894,3162711095074, 15774862353614,80687636530882,422713072650286, 2265833731786594] |