n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 74 |
6 | 647 |
7 | 6961 |
8 | 89739 |
9 | 1337152 |
10 | 22609111 |
11 | 427604861 |
12 | 8945156182 |
13 | 205080060435 |
14 | 5113424483894 |
15 | 137759755603055 |
16 | 3987742282544259 |
17 | 123430664010624370 |
18 | 4067922952436728611 |
19 | 142218912116692593949 |
[0,1,3,12,74,647,6961,89739,1337152,22609111, 427604861,8945156182,205080060435,5113424483894, 137759755603055,3987742282544259, 123430664010624370,4067922952436728611, 142218912116692593949] |