n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 6 |
4 | 21 |
5 | 92 |
6 | 597 |
7 | 3472 |
8 | 26537 |
9 | 209488 |
10 | 1834249 |
11 | 17750304 |
12 | 180938109 |
13 | 2024471360 |
14 | 23781199197 |
15 | 300235771648 |
16 | 3989919982673 |
17 | 56114783183104 |
18 | 830092069266577 |
19 | 12879188611161600 |
20 | 209479116176732901 |
21 | 3554985326516636672 |
[1,1,1,6,21,92,597,3472,26537,209488,1834249, 17750304,180938109,2024471360,23781199197, 300235771648,3989919982673,56114783183104, 830092069266577,12879188611161600, 209479116176732901,3554985326516636672] |