n | a(n) |
---|---|
0 | 4 |
1 | 5 |
2 | 14 |
3 | 45 |
4 | 180 |
5 | 905 |
6 | 5466 |
7 | 38297 |
8 | 306376 |
9 | 2757393 |
10 | 27574030 |
11 | 303314341 |
12 | 3639772188 |
13 | 47317038457 |
14 | 662438538482 |
15 | 9936578077425 |
16 | 158985249238800 |
17 | 2702749237059617 |
18 | 48649486267073430 |
19 | 924340239074395189 |
20 | 18486804781487903780 |
[4,5,14,45,180,905,5466,38297,306376,2757393, 27574030,303314341,3639772188,47317038457, 662438538482,9936578077425,158985249238800, 2702749237059617,48649486267073430, 924340239074395189,18486804781487903780] |