n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 41 |
5 | 179 |
6 | 909 |
7 | 3968 |
8 | 19680 |
9 | 106368 |
10 | 516905 |
11 | 2717631 |
12 | 15139485 |
13 | 77813569 |
14 | 422589823 |
15 | 2395441908 |
16 | 12734635078 |
17 | 70577595746 |
18 | 404540380566 |
19 | 2199035619696 |
20 | 12356298623126 |
21 | 71368686011040 |
22 | 394076753535029 |
23 | 2236273925952447 |
24 | 12988459939106601 |
[1,1,3,12,41,179,909,3968,19680,106368,516905, 2717631,15139485,77813569,422589823,2395441908, 12734635078,70577595746,404540380566, 2199035619696,12356298623126,71368686011040, 394076753535029,2236273925952447, 12988459939106601] |