n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 109 |
4 | 800 |
5 | 19501 |
6 | 168952 |
7 | 3979830 |
8 | 37566720 |
9 | 862687045 |
10 | 8615396504 |
11 | 193710517650 |
12 | 2015475061184 |
13 | 44516469004294 |
14 | 478043160040240 |
15 | 10399216983867484 |
16 | 114539008771344384 |
17 | 2459029841101222485 |
18 | 27657033766735102744 |
19 | 586949749681986718650 |
20 | 6719200545824895620800 |
21 | 141147097812860184921810 |
[0,1,4,109,800,19501,168952,3979830,37566720, 862687045,8615396504,193710517650,2015475061184, 44516469004294,478043160040240,10399216983867484, 114539008771344384,2459029841101222485, 27657033766735102744,586949749681986718650, 6719200545824895620800,141147097812860184921810] |