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| n | a(n) |
|---|---|
| 6 | 0 |
| 7 | 1 |
| 8 | 28 |
| 9 | 416 |
| 10 | 4658 |
| 11 | 45095 |
| 12 | 404275 |
| 13 | 3485508 |
| 14 | 29543547 |
| 15 | 249503219 |
| 16 | 2117198929 |
| 17 | 18150345636 |
| 18 | 157763663783 |
| 19 | 1393693891866 |
| 20 | 12533041906408 |
| 21 | 114848421469811 |
| 22 | 1073139463501186 |
| 23 | 10228550424931925 |
| 24 | 99466689685460697 |
| 25 | 986879431951833062 |
| 26 | 9989549096908876766 |
[0,1,28,416,4658,45095,404275,3485508,29543547, 249503219,2117198929,18150345636,157763663783, 1393693891866,12533041906408,114848421469811, 1073139463501186,10228550424931925, 99466689685460697,986879431951833062, 9989549096908876766] |