n | a(n) |
---|---|
1 | 4 |
2 | 21 |
3 | 45 |
4 | 142 |
5 | 439 |
6 | 1261 |
7 | 3826 |
8 | 11770 |
9 | 35152 |
10 | 106027 |
11 | 323339 |
12 | 977445 |
13 | 2953775 |
14 | 8969080 |
15 | 27186554 |
16 | 82305975 |
17 | 249564286 |
18 | 756677843 |
19 | 2292774262 |
20 | 6949799639 |
21 | 21069414963 |
22 | 63860628612 |
23 | 193568100369 |
24 | 586780928193 |
25 | 1778655998433 |
[4,21,45,142,439,1261,3826,11770,35152,106027, 323339,977445,2953775,8969080,27186554,82305975, 249564286,756677843,2292774262,6949799639, 21069414963,63860628612,193568100369,586780928193, 1778655998433] |