n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 6 |
5 | 21 |
6 | 110 |
7 | 673 |
8 | 4312 |
9 | 34260 |
10 | 280212 |
11 | 2648581 |
12 | 26580840 |
13 | 292468333 |
14 | 3453838544 |
15 | 43672689816 |
16 | 590203920256 |
17 | 8458029201433 |
18 | 128528293405392 |
19 | 2059731511022935 |
20 | 34762308371221224 |
21 | 615898019175914166 |
22 | 11432263502365894916 |
23 | 221855824404176472115 |
[1,0,1,1,6,21,110,673,4312,34260,280212,2648581, 26580840,292468333,3453838544,43672689816, 590203920256,8458029201433,128528293405392, 2059731511022935,34762308371221224, 615898019175914166,11432263502365894916, 221855824404176472115] |