n | a(n) |
---|---|
2 | 1 |
3 | 4 |
4 | 10 |
5 | 29 |
6 | 81 |
7 | 230 |
8 | 652 |
9 | 1854 |
10 | 5278 |
11 | 15048 |
12 | 42956 |
13 | 122772 |
14 | 351300 |
15 | 1006344 |
16 | 2885952 |
17 | 8285001 |
18 | 23809113 |
19 | 68490060 |
20 | 197211394 |
21 | 568385609 |
22 | 1639635613 |
23 | 4734036134 |
24 | 13679894484 |
25 | 39562904855 |
26 | 114507905551 |
27 | 331674931656 |
28 | 961408814434 |
[1,4,10,29,81,230,652,1854,5278,15048,42956, 122772,351300,1006344,2885952,8285001,23809113, 68490060,197211394,568385609,1639635613, 4734036134,13679894484,39562904855,114507905551, 331674931656,961408814434] |