n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 15 |
4 | 83 |
5 | 561 |
6 | 6332 |
7 | 88086 |
8 | 1561008 |
9 | 31966485 |
10 | 746278033 |
11 | 19441692751 |
12 | 559268543516 |
13 | 17599832876941 |
14 | 601468320356528 |
15 | 22182618618501188 |
16 | 878172760660077348 |
17 | 37144096971415045713 |
18 | 1671734397769302244110 |
19 | 79770632874353931073165 |
20 | 4022719642533206402716726 |
[1,4,15,83,561,6332,88086,1561008,31966485, 746278033,19441692751,559268543516,17599832876941, 601468320356528,22182618618501188, 878172760660077348,37144096971415045713, 1671734397769302244110,79770632874353931073165, 4022719642533206402716726] |