n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 18 |
4 | 121 |
5 | 928 |
6 | 6240 |
7 | 46617 |
8 | 360997 |
9 | 2889223 |
10 | 23635458 |
11 | 195429765 |
12 | 1643489944 |
13 | 13988813548 |
14 | 120403750665 |
15 | 1045933596357 |
16 | 9158182856203 |
17 | 80773120032142 |
18 | 716955897008481 |
19 | 6400569497637804 |
20 | 57436282624514236 |
[1,1,3,18,121,928,6240,46617,360997,2889223, 23635458,195429765,1643489944,13988813548, 120403750665,1045933596357,9158182856203, 80773120032142,716955897008481,6400569497637804, 57436282624514236] |