n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 10 |
5 | 45 |
6 | 251 |
7 | 1666 |
8 | 12701 |
9 | 109544 |
10 | 1054364 |
11 | 11202617 |
12 | 130230419 |
13 | 1644159040 |
14 | 22401666926 |
15 | 327624378798 |
16 | 5119130918712 |
17 | 85105551523595 |
18 | 1499985345603354 |
19 | 27937227061862467 |
20 | 548268081089050918 |
[1,1,1,3,10,45,251,1666,12701,109544,1054364, 11202617,130230419,1644159040,22401666926, 327624378798,5119130918712,85105551523595, 1499985345603354,27937227061862467, 548268081089050918] |