n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 9 |
5 | 96 |
6 | 190 |
7 | 4320 |
8 | 11025 |
9 | 179200 |
10 | 805896 |
11 | 36288000 |
12 | 63155400 |
13 | 5748019200 |
14 | 18861448320 |
15 | 380872267776 |
16 | 4108830350625 |
17 | 334764638208000 |
18 | 778062273788800 |
19 | 115242726703104000 |
20 | 310526396168644656 |
21 | 15009607805018112000 |
22 | 208853182616336294400 |
[1,1,1,4,9,96,190,4320,11025,179200,805896, 36288000,63155400,5748019200,18861448320, 380872267776,4108830350625,334764638208000, 778062273788800,115242726703104000, 310526396168644656,15009607805018112000, 208853182616336294400] |