n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 20 |
3 | 234 |
4 | 2144 |
5 | 16750 |
6 | 117432 |
7 | 761460 |
8 | 4654848 |
9 | 27173718 |
10 | 152867000 |
11 | 834212236 |
12 | 4438175040 |
13 | 23108423884 |
14 | 118111709744 |
15 | 594059985000 |
16 | 2946077521920 |
17 | 14429322555750 |
18 | 69892354873080 |
19 | 335194270938780 |
20 | 1593211647720000 |
21 | 7511501237722020 |
22 | 35153884344493200 |
[0,1,20,234,2144,16750,117432,761460,4654848, 27173718,152867000,834212236,4438175040, 23108423884,118111709744,594059985000, 2946077521920,14429322555750,69892354873080, 335194270938780,1593211647720000,7511501237722020, 35153884344493200] |