n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 6 |
3 | 25 |
4 | 90 |
5 | 306 |
6 | 1004 |
7 | 3226 |
8 | 10218 |
9 | 32043 |
10 | 99748 |
11 | 308787 |
12 | 951772 |
13 | 2923563 |
14 | 8955342 |
15 | 27368895 |
16 | 83484042 |
17 | 254244033 |
18 | 773219196 |
19 | 2348780937 |
20 | 7127522136 |
21 | 21609615822 |
22 | 65465845254 |
23 | 198189732798 |
24 | 599624708588 |
25 | 1813169256151 |
26 | 5480019176754 |
27 | 16555101318735 |
[0,1,6,25,90,306,1004,3226,10218,32043,99748, 308787,951772,2923563,8955342,27368895,83484042, 254244033,773219196,2348780937,7127522136, 21609615822,65465845254,198189732798,599624708588, 1813169256151,5480019176754,16555101318735] |