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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 73 |
| 4 | 1364 |
| 5 | 34585 |
| 6 | 1110406 |
| 7 | 43200535 |
| 8 | 1975744856 |
| 9 | 103892750209 |
| 10 | 6176282882570 |
| 11 | 409635957376591 |
| 12 | 29988473838531748 |
| 13 | 2402004132488328433 |
| 14 | 208956515057627326094 |
| 15 | 19619264794744128427495 |
| 16 | 1977503574407863125008816 |
| 17 | 212975277029523353673126529 |
| 18 | 24408338689788753822318157330 |
[1,1,6,73,1364,34585,1110406,43200535,1975744856, 103892750209,6176282882570,409635957376591, 29988473838531748,2402004132488328433, 208956515057627326094,19619264794744128427495, 1977503574407863125008816, 212975277029523353673126529, 24408338689788753822318157330] |