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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 49 |
| 3 | 392 |
| 4 | 3528 |
| 5 | 38808 |
| 6 | 543312 |
| 7 | 10322928 |
| 8 | 278719056 |
| 9 | 11148762240 |
| 10 | 680074496640 |
| 11 | 64607077180800 |
| 12 | 9691061577120000 |
| 13 | 2316163716931680000 |
| 14 | 887090703584833440000 |
| 15 | 546447873408257399040000 |
| 16 | 542622738294399597246720000 |
| 17 | 869824249485922554386492160000 |
[1,7,49,392,3528,38808,543312,10322928,278719056, 11148762240,680074496640,64607077180800, 9691061577120000,2316163716931680000, 887090703584833440000,546447873408257399040000, 542622738294399597246720000, 869824249485922554386492160000] |