n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 18 |
3 | 144 |
4 | 1368 |
5 | 14400 |
6 | 160992 |
7 | 1861632 |
8 | 21919104 |
9 | 260508672 |
10 | 3110985216 |
11 | 37241118720 |
12 | 446349219840 |
13 | 5352925446144 |
14 | 64215514275840 |
15 | 770468624990208 |
16 | 9244918222258176 |
17 | 110934787001942016 |
18 | 1331192054033547264 |
19 | 15974152308466384896 |
20 | 191688913661984243712 |
[1,3,18,144,1368,14400,160992,1861632,21919104, 260508672,3110985216,37241118720,446349219840, 5352925446144,64215514275840,770468624990208, 9244918222258176,110934787001942016, 1331192054033547264,15974152308466384896, 191688913661984243712] |