n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 3 |
3 | 9 |
4 | 54 |
5 | 351 |
6 | 2673 |
7 | 22842 |
8 | 216513 |
9 | 2248965 |
10 | 25351704 |
11 | 307699965 |
12 | 3995419365 |
13 | 55207193328 |
14 | 808078734999 |
15 | 12480510487509 |
16 | 202697232446070 |
17 | 3451417004044323 |
18 | 61450890989472837 |
19 | 1141331486235356178 |
20 | 22066085726516137149 |
21 | 443236553318792110113 |
22 | 9233934519951699602400 |
[1,0,3,9,54,351,2673,22842,216513,2248965, 25351704,307699965,3995419365,55207193328, 808078734999,12480510487509,202697232446070, 3451417004044323,61450890989472837, 1141331486235356178,22066085726516137149, 443236553318792110113,9233934519951699602400] |