n | a(n) |
---|---|
1 | 1 |
2 | 21 |
3 | 181 |
4 | 1199 |
5 | 8173 |
6 | 57097 |
7 | 398375 |
8 | 2773933 |
9 | 19314785 |
10 | 134507787 |
11 | 936720513 |
12 | 6523315045 |
13 | 45428247915 |
14 | 316361693953 |
15 | 2203138855813 |
16 | 15342630706087 |
17 | 106845881585421 |
18 | 744073337324881 |
19 | 5181717103636911 |
20 | 36085410931557557 |
[1,21,181,1199,8173,57097,398375,2773933,19314785, 134507787,936720513,6523315045,45428247915, 316361693953,2203138855813,15342630706087, 106845881585421,744073337324881,5181717103636911, 36085410931557557] |