n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 8 |
4 | 14 |
5 | 52 |
6 | 1516 |
7 | 7582 |
8 | 46338 |
9 | 501270 |
10 | 3535396 |
11 | 25480614 |
12 | 220369120 |
13 | 1716544860 |
14 | 13279246254 |
15 | 108919001860 |
16 | 873463942418 |
17 | 6971258302462 |
18 | 56716000746978 |
19 | 460015101808320 |
20 | 3726764125840338 |
21 | 30399952923410062 |
[0,0,8,14,52,1516,7582,46338,501270,3535396, 25480614,220369120,1716544860,13279246254, 108919001860,873463942418,6971258302462, 56716000746978,460015101808320,3726764125840338, 30399952923410062] |