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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 18 |
| 3 | 31 |
| 4 | 170 |
| 5 | 792 |
| 6 | 3759 |
| 7 | 18876 |
| 8 | 90956 |
| 9 | 474685 |
| 10 | 2426611 |
| 11 | 12314640 |
| 12 | 63224089 |
| 13 | 324415176 |
| 14 | 1661929097 |
| 15 | 8516748514 |
| 16 | 43702916079 |
| 17 | 224090240059 |
| 18 | 1149079576777 |
| 19 | 5893973921589 |
| 20 | 30227924527477 |
| 21 | 155026753983222 |
| 22 | 795103603034446 |
[0,18,31,170,792,3759,18876,90956,474685,2426611, 12314640,63224089,324415176,1661929097,8516748514, 43702916079,224090240059,1149079576777, 5893973921589,30227924527477,155026753983222, 795103603034446] |