n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 14 |
3 | 48 |
4 | 166 |
5 | 577 |
6 | 2022 |
7 | 7147 |
8 | 25469 |
9 | 91441 |
10 | 330516 |
11 | 1201900 |
12 | 4394415 |
13 | 16145630 |
14 | 59583202 |
15 | 220763545 |
16 | 820933365 |
17 | 3062860665 |
18 | 11462088180 |
19 | 43014021480 |
20 | 161834455920 |
21 | 610326088974 |
22 | 2306785989804 |
23 | 8736538458998 |
[1,4,14,48,166,577,2022,7147,25469,91441,330516, 1201900,4394415,16145630,59583202,220763545, 820933365,3062860665,11462088180,43014021480, 161834455920,610326088974,2306785989804, 8736538458998] |