n | a(n) |
---|---|
1 | 0 |
2 | 3 |
3 | 5 |
4 | 20 |
5 | 54 |
6 | 169 |
7 | 499 |
8 | 1506 |
9 | 4508 |
10 | 13535 |
11 | 40593 |
12 | 121792 |
13 | 365362 |
14 | 1096101 |
15 | 3288287 |
16 | 9864878 |
17 | 29594616 |
18 | 88783867 |
19 | 266351581 |
20 | 799054764 |
21 | 2397164270 |
22 | 7191492833 |
23 | 21574478475 |
24 | 64723435450 |
25 | 194170306324 |
26 | 582510918999 |
[0,3,5,20,54,169,499,1506,4508,13535,40593,121792, 365362,1096101,3288287,9864878,29594616,88783867, 266351581,799054764,2397164270,7191492833, 21574478475,64723435450,194170306324,582510918999] |