n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 20 |
3 | 62 |
4 | 188 |
5 | 566 |
6 | 1700 |
7 | 5102 |
8 | 15308 |
9 | 45926 |
10 | 137780 |
11 | 413342 |
12 | 1240028 |
13 | 3720086 |
14 | 11160260 |
15 | 33480782 |
16 | 100442348 |
17 | 301327046 |
18 | 903981140 |
19 | 2711943422 |
20 | 8135830268 |
21 | 24407490806 |
22 | 73222472420 |
23 | 219667417262 |
24 | 659002251788 |
[1,6,20,62,188,566,1700,5102,15308,45926,137780, 413342,1240028,3720086,11160260,33480782, 100442348,301327046,903981140,2711943422, 8135830268,24407490806,73222472420,219667417262, 659002251788] |