n | a(n) |
---|---|
0 | 1 |
1 | 8 |
2 | 56 |
3 | 392 |
4 | 2648 |
5 | 17960 |
6 | 120056 |
7 | 804824 |
8 | 5351720 |
9 | 35652680 |
10 | 236291096 |
11 | 1568049560 |
12 | 10368669992 |
13 | 68626647608 |
14 | 453032542040 |
15 | 2992783648424 |
16 | 19731335857592 |
17 | 130161040083608 |
18 | 857282278813256 |
19 | 5648892048530888 |
20 | 37175039569217672 |
21 | 244738250638121768 |
[1,8,56,392,2648,17960,120056,804824,5351720, 35652680,236291096,1568049560,10368669992, 68626647608,453032542040,2992783648424, 19731335857592,130161040083608,857282278813256, 5648892048530888,37175039569217672, 244738250638121768] |