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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 17 |
| 3 | 406 |
| 4 | 10257 |
| 5 | 268126 |
| 6 | 7213166 |
| 7 | 198978074 |
| 8 | 5609330705 |
| 9 | 161095277710 |
| 10 | 4700175389142 |
| 11 | 138986764820410 |
| 12 | 4157185583199534 |
| 13 | 125568602682092818 |
| 14 | 3825026187780837266 |
| 15 | 117376010145070696906 |
| 16 | 3625095243230562818065 |
| 17 | 112596592142021739522670 |
| 18 | 3514965607470183733302470 |
[0,1,17,406,10257,268126,7213166,198978074, 5609330705,161095277710,4700175389142, 138986764820410,4157185583199534, 125568602682092818,3825026187780837266, 117376010145070696906,3625095243230562818065, 112596592142021739522670, 3514965607470183733302470] |