n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 2 |
5 | 25 |
6 | 198 |
7 | 1274 |
8 | 7280 |
9 | 38556 |
10 | 193800 |
11 | 937992 |
12 | 4412826 |
13 | 20309575 |
14 | 91861770 |
15 | 409704750 |
16 | 1806342720 |
17 | 7887861960 |
18 | 34166674800 |
19 | 146977222320 |
20 | 628521016500 |
21 | 2673950235138 |
22 | 11324837666604 |
23 | 47773836727540 |
24 | 200828153398752 |
[0,0,0,2,25,198,1274,7280,38556,193800,937992, 4412826,20309575,91861770,409704750,1806342720, 7887861960,34166674800,146977222320,628521016500, 2673950235138,11324837666604,47773836727540, 200828153398752] |