n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 280 |
3 | 3521 |
4 | 42945 |
5 | 521913 |
6 | 6379233 |
7 | 78640740 |
8 | 978172724 |
9 | 12270946072 |
10 | 155139813381 |
11 | 1975245161155 |
12 | 25308115539770 |
13 | 326106155857041 |
14 | 4223481710794292 |
15 | 54951230993010196 |
16 | 717942326681863941 |
17 | 9415448193554916520 |
18 | 123904268078599269723 |
19 | 1635676807214777434793 |
[1,20,280,3521,42945,521913,6379233,78640740, 978172724,12270946072,155139813381,1975245161155, 25308115539770,326106155857041,4223481710794292, 54951230993010196,717942326681863941, 9415448193554916520,123904268078599269723, 1635676807214777434793] |