n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 4 |
5 | 0 |
6 | 32 |
7 | 80 |
8 | 560 |
9 | 2080 |
10 | 10720 |
11 | 46496 |
12 | 220896 |
13 | 998432 |
14 | 4634272 |
15 | 21207840 |
16 | 97791904 |
17 | 449099040 |
18 | 2066934176 |
19 | 9501790240 |
20 | 43707407520 |
21 | 200983135008 |
22 | 924361443232 |
23 | 4250915450400 |
24 | 19549937082016 |
25 | 89907588137248 |
[0,0,0,4,0,32,80,560,2080,10720,46496,220896, 998432,4634272,21207840,97791904,449099040, 2066934176,9501790240,43707407520,200983135008, 924361443232,4250915450400,19549937082016, 89907588137248] |