n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 21 |
4 | 146 |
5 | 1101 |
6 | 10632 |
7 | 107062 |
8 | 1151802 |
9 | 12845442 |
10 | 147845706 |
11 | 1743640908 |
12 | 20988257544 |
13 | 256987965379 |
14 | 3192893716320 |
15 | 40171643847696 |
16 | 510997002280522 |
17 | 6563060603543658 |
18 | 85017387536789916 |
19 | 1109744672540225367 |
20 | 14585261039005676046 |
[1,1,6,21,146,1101,10632,107062,1151802,12845442, 147845706,1743640908,20988257544,256987965379, 3192893716320,40171643847696,510997002280522, 6563060603543658,85017387536789916, 1109744672540225367,14585261039005676046] |