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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 39 |
| 4 | 320 |
| 5 | 3281 |
| 6 | 40558 |
| 7 | 586751 |
| 8 | 9719616 |
| 9 | 181353777 |
| 10 | 3762893750 |
| 11 | 85934344775 |
| 12 | 2141853777856 |
| 13 | 57852105131809 |
| 14 | 1683237633305502 |
| 15 | 52483648929669119 |
| 16 | 1745835287515739328 |
| 17 | 61712106494672572641 |
| 18 | 2309989101145068446502 |
| 19 | 91279147976756195994983 |
[1,6,39,320,3281,40558,586751,9719616,181353777, 3762893750,85934344775,2141853777856, 57852105131809,1683237633305502,52483648929669119, 1745835287515739328,61712106494672572641, 2309989101145068446502,91279147976756195994983] |