n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 12 |
3 | 57 |
4 | 306 |
5 | 1806 |
6 | 11508 |
7 | 78147 |
8 | 559962 |
9 | 4201038 |
10 | 32792472 |
11 | 264946446 |
12 | 2206077804 |
13 | 18860908644 |
14 | 165050642736 |
15 | 1474389557739 |
16 | 13413397423482 |
17 | 124030117316238 |
18 | 1163661348170328 |
19 | 11060842687616610 |
20 | 106377560784576612 |
21 | 1034009073326130876 |
[1,3,12,57,306,1806,11508,78147,559962,4201038, 32792472,264946446,2206077804,18860908644, 165050642736,1474389557739,13413397423482, 124030117316238,1163661348170328, 11060842687616610,106377560784576612, 1034009073326130876] |