n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 56 |
5 | 284 |
6 | 1520 |
7 | 8449 |
8 | 48303 |
9 | 282207 |
10 | 1677489 |
11 | 10112546 |
12 | 61678702 |
13 | 379919672 |
14 | 2359991520 |
15 | 14767164162 |
16 | 92993252612 |
17 | 588904075546 |
18 | 3748029131834 |
19 | 23960546501520 |
20 | 153790930664222 |
21 | 990690415079898 |
22 | 6402865318618654 |
23 | 41506375396111624 |
[1,1,3,12,56,284,1520,8449,48303,282207,1677489, 10112546,61678702,379919672,2359991520, 14767164162,92993252612,588904075546, 3748029131834,23960546501520,153790930664222, 990690415079898,6402865318618654, 41506375396111624] |