n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 33 |
6 | 126 |
7 | 510 |
8 | 2127 |
9 | 9113 |
10 | 39809 |
11 | 176735 |
12 | 794937 |
13 | 3615045 |
14 | 16593156 |
15 | 76773972 |
16 | 357692784 |
17 | 1676664234 |
18 | 7901590287 |
19 | 37416151209 |
20 | 177935914254 |
21 | 849461877990 |
22 | 4069507806000 |
23 | 19557840481380 |
24 | 94267485120510 |
25 | 455575848843726 |
26 | 2207117072396682 |
27 | 10717034365197286 |
[0,1,1,3,9,33,126,510,2127,9113,39809,176735, 794937,3615045,16593156,76773972,357692784, 1676664234,7901590287,37416151209,177935914254, 849461877990,4069507806000,19557840481380, 94267485120510,455575848843726,2207117072396682, 10717034365197286] |