n | a(n) |
---|---|
1 | 4 |
2 | 15 |
3 | 53 |
4 | 170 |
5 | 497 |
6 | 1407 |
7 | 3962 |
8 | 10867 |
9 | 30956 |
10 | 87542 |
11 | 248218 |
12 | 711766 |
13 | 2029175 |
14 | 5781750 |
15 | 16430665 |
16 | 46462998 |
17 | 131837484 |
18 | 374313604 |
19 | 1064195679 |
20 | 3028749764 |
21 | 8608397556 |
22 | 24458778262 |
23 | 69472002871 |
24 | 197274426596 |
25 | 560475590510 |
[4,15,53,170,497,1407,3962,10867,30956,87542, 248218,711766,2029175,5781750,16430665,46462998, 131837484,374313604,1064195679,3028749764, 8608397556,24458778262,69472002871,197274426596, 560475590510] |