n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 9 |
3 | 30 |
4 | 105 |
5 | 378 |
6 | 1386 |
7 | 5148 |
8 | 19305 |
9 | 72930 |
10 | 277134 |
11 | 1058148 |
12 | 4056234 |
13 | 15600900 |
14 | 60174900 |
15 | 232676280 |
16 | 901620585 |
17 | 3500409330 |
18 | 13612702950 |
19 | 53017895700 |
20 | 206769793230 |
21 | 807386811660 |
22 | 3156148445580 |
23 | 12350146091400 |
24 | 48371405524650 |
[1,3,9,30,105,378,1386,5148,19305,72930,277134, 1058148,4056234,15600900,60174900,232676280, 901620585,3500409330,13612702950,53017895700, 206769793230,807386811660,3156148445580, 12350146091400,48371405524650] |