n | a(n) |
---|---|
1 | 0 |
2 | 6 |
3 | 52 |
4 | 428 |
5 | 3552 |
6 | 29790 |
7 | 251980 |
8 | 2145822 |
9 | 18373296 |
10 | 158025186 |
11 | 1364247180 |
12 | 11815188000 |
13 | 102606325136 |
14 | 893175905778 |
15 | 7791151047204 |
16 | 68086757974300 |
17 | 595980599148672 |
18 | 5224392846601730 |
19 | 45857525238248604 |
20 | 402997448078904948 |
21 | 3545390129177031520 |
22 | 31221592914677352138 |
[0,6,52,428,3552,29790,251980,2145822,18373296, 158025186,1364247180,11815188000,102606325136, 893175905778,7791151047204,68086757974300, 595980599148672,5224392846601730, 45857525238248604,402997448078904948, 3545390129177031520,31221592914677352138] |