n | a(n) |
---|---|
3 | 1 |
4 | 3 |
5 | 9 |
6 | 25 |
7 | 69 |
8 | 186 |
9 | 503 |
10 | 1353 |
11 | 3651 |
12 | 9865 |
13 | 26748 |
14 | 72729 |
15 | 198447 |
16 | 543159 |
17 | 1491402 |
18 | 4107152 |
19 | 11342826 |
20 | 31408719 |
21 | 87189987 |
22 | 242603970 |
23 | 676524372 |
24 | 1890436117 |
25 | 5292722721 |
26 | 14845095153 |
27 | 41708679697 |
28 | 117372283086 |
29 | 330795842217 |
[1,3,9,25,69,186,503,1353,3651,9865,26748,72729, 198447,543159,1491402,4107152,11342826,31408719, 87189987,242603970,676524372,1890436117, 5292722721,14845095153,41708679697,117372283086, 330795842217] |