n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 9 |
5 | 44 |
6 | 251 |
7 | 1665 |
8 | 12700 |
9 | 109544 |
10 | 1054363 |
11 | 11202616 |
12 | 130230419 |
13 | 1644159040 |
14 | 22401666926 |
15 | 327624378797 |
16 | 5119130918712 |
17 | 85105551523594 |
18 | 1499985345603353 |
19 | 27937227061862467 |
20 | 548268081089050917 |
[1,0,1,2,9,44,251,1665,12700,109544,1054363, 11202616,130230419,1644159040,22401666926, 327624378797,5119130918712,85105551523594, 1499985345603353,27937227061862467, 548268081089050917] |