n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 20 |
4 | 72 |
5 | 464 |
6 | 2080 |
7 | 11584 |
8 | 56448 |
9 | 298240 |
10 | 1499648 |
11 | 7771136 |
12 | 39536640 |
13 | 203411456 |
14 | 1039409152 |
15 | 5333401600 |
16 | 27297349632 |
17 | 139929124864 |
18 | 716615843840 |
19 | 3672097685504 |
20 | 18810048872448 |
21 | 96373660712960 |
22 | 493708103385088 |
23 | 2529394778177536 |
24 | 12958119210516480 |
[0,1,2,20,72,464,2080,11584,56448,298240,1499648, 7771136,39536640,203411456,1039409152,5333401600, 27297349632,139929124864,716615843840, 3672097685504,18810048872448,96373660712960, 493708103385088,2529394778177536, 12958119210516480] |