n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 51 |
4 | 470 |
5 | 4716 |
6 | 49350 |
7 | 534115 |
8 | 5929892 |
9 | 67175779 |
10 | 773473709 |
11 | 9025907984 |
12 | 106511693025 |
13 | 1268898400188 |
14 | 15240421643846 |
15 | 184348620664449 |
16 | 2243749948233175 |
17 | 27459089491691552 |
18 | 337685454820968084 |
19 | 4170918486201555250 |
20 | 51719670553572755173 |
21 | 643610071084847351183 |
[1,1,6,51,470,4716,49350,534115,5929892,67175779, 773473709,9025907984,106511693025,1268898400188, 15240421643846,184348620664449,2243749948233175, 27459089491691552,337685454820968084, 4170918486201555250,51719670553572755173, 643610071084847351183] |