n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 25 |
4 | 210 |
5 | 2184 |
6 | 26796 |
7 | 376233 |
8 | 5920200 |
9 | 102816714 |
10 | 1947916100 |
11 | 39890416020 |
12 | 876478739164 |
13 | 20537052247300 |
14 | 510548782729680 |
15 | 13407568735200525 |
16 | 370553407586717490 |
17 | 10742998644116921160 |
18 | 325786278993936753300 |
19 | 10307990595756667951830 |
[1,1,4,25,210,2184,26796,376233,5920200,102816714, 1947916100,39890416020,876478739164, 20537052247300,510548782729680,13407568735200525, 370553407586717490,10742998644116921160, 325786278993936753300,10307990595756667951830] |