n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 9 |
4 | 28 |
5 | 93 |
6 | 333 |
7 | 1271 |
8 | 5064 |
9 | 20673 |
10 | 85460 |
11 | 355659 |
12 | 1486719 |
13 | 6238608 |
14 | 26278281 |
15 | 111114558 |
16 | 471608944 |
17 | 2008906581 |
18 | 8586410085 |
19 | 36816550550 |
20 | 158332335279 |
21 | 682843960665 |
22 | 2952865525730 |
23 | 12802463157570 |
24 | 55646477022330 |
25 | 242465061290160 |
26 | 1059022767175173 |
27 | 4636452916770489 |
[1,3,9,28,93,333,1271,5064,20673,85460,355659, 1486719,6238608,26278281,111114558,471608944, 2008906581,8586410085,36816550550,158332335279, 682843960665,2952865525730,12802463157570, 55646477022330,242465061290160,1059022767175173, 4636452916770489] |