n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 36 |
3 | 196 |
4 | 1071 |
5 | 5796 |
6 | 31395 |
7 | 169884 |
8 | 919413 |
9 | 4975322 |
10 | 26924106 |
11 | 145698840 |
12 | 788446400 |
13 | 4266656226 |
14 | 23088902733 |
15 | 124944995676 |
16 | 676136621430 |
17 | 3658895818470 |
18 | 19800020091895 |
19 | 107147296401684 |
20 | 579824822459421 |
21 | 3137707025200000 |
[1,6,36,196,1071,5796,31395,169884,919413,4975322, 26924106,145698840,788446400,4266656226, 23088902733,124944995676,676136621430, 3658895818470,19800020091895,107147296401684, 579824822459421,3137707025200000] |