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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 106 |
| 4 | 2493 |
| 5 | 79866 |
| 6 | 3245591 |
| 7 | 159980122 |
| 8 | 9275436505 |
| 9 | 618568035130 |
| 10 | 46649552389515 |
| 11 | 3925749706207770 |
| 12 | 364709764578733349 |
| 13 | 37075283015959294666 |
| 14 | 4093764536232959203999 |
| 15 | 487906508897555966553370 |
| 16 | 62428514041971948893889969 |
| 17 | 8535465441907344876112112346 |
[1,1,7,106,2493,79866,3245591,159980122, 9275436505,618568035130,46649552389515, 3925749706207770,364709764578733349, 37075283015959294666,4093764536232959203999, 487906508897555966553370, 62428514041971948893889969, 8535465441907344876112112346] |