n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 6 |
3 | 16 |
4 | 60 |
5 | 305 |
6 | 1988 |
7 | 15951 |
8 | 153171 |
9 | 1722693 |
10 | 22296396 |
11 | 327270440 |
12 | 5381716953 |
13 | 98134088419 |
14 | 1967105567802 |
15 | 43024511648982 |
16 | 1020235144731236 |
17 | 26083065249549660 |
18 | 715430961891290714 |
19 | 20962974995245684878 |
20 | 653654392800091507791 |
21 | 21615444263990028093227 |
[1,3,6,16,60,305,1988,15951,153171,1722693, 22296396,327270440,5381716953,98134088419, 1967105567802,43024511648982,1020235144731236, 26083065249549660,715430961891290714, 20962974995245684878,653654392800091507791, 21615444263990028093227] |