n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 15 |
4 | 51 |
5 | 204 |
6 | 933 |
7 | 5115 |
8 | 32385 |
9 | 245214 |
10 | 2090961 |
11 | 20648547 |
12 | 221781915 |
13 | 2679261840 |
14 | 34419818241 |
15 | 488332067679 |
16 | 7271691132033 |
17 | 118162937240730 |
18 | 1998172269602685 |
19 | 36552556172242359 |
20 | 691550102624919651 |
21 | 14056929989746659252 |
[1,2,5,15,51,204,933,5115,32385,245214,2090961, 20648547,221781915,2679261840,34419818241, 488332067679,7271691132033,118162937240730, 1998172269602685,36552556172242359, 691550102624919651,14056929989746659252] |