n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 6 |
4 | 36 |
5 | 150 |
6 | 534 |
7 | 1806 |
8 | 5760 |
9 | 18144 |
10 | 55830 |
11 | 171006 |
12 | 518580 |
13 | 1569750 |
14 | 4732014 |
15 | 14250450 |
16 | 42844320 |
17 | 128746950 |
18 | 386615376 |
19 | 1160688606 |
20 | 3483582660 |
21 | 10454059938 |
22 | 31368305694 |
23 | 94118013006 |
24 | 282378679920 |
25 | 847187946000 |
26 | 2541662931990 |
27 | 7625194813656 |
28 | 22875982414740 |
[0,0,6,36,150,534,1806,5760,18144,55830,171006, 518580,1569750,4732014,14250450,42844320, 128746950,386615376,1160688606,3483582660, 10454059938,31368305694,94118013006,282378679920, 847187946000,2541662931990,7625194813656, 22875982414740] |