n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 16 |
3 | 128 |
4 | 1280 |
5 | 16384 |
6 | 249856 |
7 | 4456448 |
8 | 90767360 |
9 | 2080374784 |
10 | 52975108096 |
11 | 1483911200768 |
12 | 45344872202240 |
13 | 1501108249821184 |
14 | 53515555843342336 |
15 | 2044143848640217088 |
16 | 83285910482761809920 |
17 | 3605459138582973251584 |
18 | 165262072909347030040576 |
19 | 7995891855149741436305408 |
[1,4,16,128,1280,16384,249856,4456448,90767360, 2080374784,52975108096,1483911200768, 45344872202240,1501108249821184,53515555843342336, 2044143848640217088,83285910482761809920, 3605459138582973251584,165262072909347030040576, 7995891855149741436305408] |