n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 25 |
4 | 164 |
5 | 1092 |
6 | 7954 |
7 | 57519 |
8 | 429936 |
9 | 3205504 |
10 | 24288784 |
11 | 184062519 |
12 | 1407419548 |
13 | 10773952376 |
14 | 82925706270 |
15 | 639182387805 |
16 | 4944237734904 |
17 | 38299501221912 |
18 | 297409232997320 |
19 | 2312508964364352 |
20 | 18013343447396448 |
21 | 140477702503827052 |
[1,6,25,164,1092,7954,57519,429936,3205504, 24288784,184062519,1407419548,10773952376, 82925706270,639182387805,4944237734904, 38299501221912,297409232997320,2312508964364352, 18013343447396448,140477702503827052] |