n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 13 |
4 | 69 |
5 | 431 |
6 | 3103 |
7 | 25341 |
8 | 231689 |
9 | 2345851 |
10 | 26065011 |
11 | 315386633 |
12 | 4128697741 |
13 | 58145826519 |
14 | 876660153671 |
15 | 14089181041141 |
16 | 240455356435473 |
17 | 4343224875615731 |
18 | 82776756452911579 |
19 | 1660133837750060001 |
20 | 34950186057896000021 |
21 | 770651602576606800463 |
[1,1,3,13,69,431,3103,25341,231689,2345851, 26065011,315386633,4128697741,58145826519, 876660153671,14089181041141,240455356435473, 4343224875615731,82776756452911579, 1660133837750060001,34950186057896000021, 770651602576606800463] |