n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 17 |
4 | 42 |
5 | 654 |
6 | 2712 |
7 | 44568 |
8 | 264240 |
9 | 4721040 |
10 | 36694080 |
11 | 716523840 |
12 | 6917823360 |
13 | 147356496000 |
14 | 1703866752000 |
15 | 39427129728000 |
16 | 531844621056000 |
17 | 13306234652928000 |
18 | 205302142854144000 |
19 | 5527796004025344000 |
20 | 96066041002702848000 |
21 | 2771519306950969344000 |
[1,1,17,42,654,2712,44568,264240,4721040,36694080, 716523840,6917823360,147356496000,1703866752000, 39427129728000,531844621056000,13306234652928000, 205302142854144000,5527796004025344000, 96066041002702848000,2771519306950969344000] |