n | a(n) |
---|---|
0 | 1 |
1 | 90 |
2 | 2475 |
3 | 35035 |
4 | 321048 |
5 | 2159136 |
6 | 11511720 |
7 | 51210225 |
8 | 196994655 |
9 | 672567610 |
10 | 2078241165 |
11 | 5900460930 |
12 | 15576433600 |
13 | 38599672320 |
14 | 90491328576 |
15 | 201987412398 |
16 | 431582100885 |
17 | 886725689850 |
18 | 1758635878615 |
19 | 3378012822261 |
20 | 6302164837320 |
21 | 11448416980000 |
22 | 20294512875000 |
[1,90,2475,35035,321048,2159136,11511720,51210225, 196994655,672567610,2078241165,5900460930, 15576433600,38599672320,90491328576,201987412398, 431582100885,886725689850,1758635878615, 3378012822261,6302164837320,11448416980000, 20294512875000] |