n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 255 |
3 | 2650 |
4 | 24521 |
5 | 210840 |
6 | 1725235 |
7 | 13631750 |
8 | 104995341 |
9 | 793395460 |
10 | 5908353815 |
11 | 43502236050 |
12 | 317443722961 |
13 | 2299938136880 |
14 | 16567618807995 |
15 | 118785894675550 |
16 | 848393691575381 |
17 | 6040178746163100 |
18 | 42890062369599775 |
19 | 303884399490790250 |
20 | 2149118961443240601 |
[1,20,255,2650,24521,210840,1725235,13631750, 104995341,793395460,5908353815,43502236050, 317443722961,2299938136880,16567618807995, 118785894675550,848393691575381,6040178746163100, 42890062369599775,303884399490790250, 2149118961443240601] |