n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 10 |
3 | 0 |
4 | 270 |
5 | 240 |
6 | 10900 |
7 | 25200 |
8 | 551950 |
9 | 2116800 |
10 | 32458860 |
11 | 169092000 |
12 | 2120787900 |
13 | 13427013600 |
14 | 149506414200 |
15 | 1075081207200 |
16 | 11143223412750 |
17 | 87198375264000 |
18 | 865743970019500 |
19 | 7171730187336000 |
20 | 69416724049550020 |
[1,0,10,0,270,240,10900,25200,551950,2116800, 32458860,169092000,2120787900,13427013600, 149506414200,1075081207200,11143223412750, 87198375264000,865743970019500,7171730187336000, 69416724049550020] |