n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 6 |
3 | 24 |
4 | 72 |
5 | 240 |
6 | 696 |
7 | 2184 |
8 | 6480 |
9 | 19656 |
10 | 58800 |
11 | 177144 |
12 | 530640 |
13 | 1594320 |
14 | 4780776 |
15 | 14348640 |
16 | 43040160 |
17 | 129140160 |
18 | 387400104 |
19 | 1162261464 |
20 | 3486725280 |
21 | 10460350992 |
22 | 31380882456 |
23 | 94143178824 |
24 | 282428998560 |
25 | 847288609200 |
26 | 2541864234000 |
27 | 7625597465304 |
[1,3,6,24,72,240,696,2184,6480,19656,58800,177144, 530640,1594320,4780776,14348640,43040160, 129140160,387400104,1162261464,3486725280, 10460350992,31380882456,94143178824,282428998560, 847288609200,2541864234000,7625597465304] |