n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 208 |
4 | 1624 |
5 | 13024 |
6 | 106336 |
7 | 879232 |
8 | 7338592 |
9 | 61699456 |
10 | 521753728 |
11 | 4433024512 |
12 | 37812715264 |
13 | 323603221504 |
14 | 2777262164992 |
15 | 23893731463168 |
16 | 206005885076992 |
17 | 1779480850438144 |
18 | 15396895523989504 |
19 | 133420304211238912 |
[1,4,28,208,1624,13024,106336,879232,7338592, 61699456,521753728,4433024512,37812715264, 323603221504,2777262164992,23893731463168, 206005885076992,1779480850438144, 15396895523989504,133420304211238912] |