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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 16 |
| 4 | 182 |
| 5 | 2400 |
| 6 | 35310 |
| 7 | 562848 |
| 8 | 9540674 |
| 9 | 169777504 |
| 10 | 3142665968 |
| 11 | 60099912320 |
| 12 | 1181283863632 |
| 13 | 23767586624960 |
| 14 | 487947659276790 |
| 15 | 10195163202404160 |
| 16 | 216335108170636650 |
| 17 | 4653803620322450880 |
| 18 | 101343766487960918460 |
| 19 | 2231268469684932939360 |
| 20 | 49614581272087698764820 |
[0,2,16,182,2400,35310,562848,9540674,169777504, 3142665968,60099912320,1181283863632, 23767586624960,487947659276790,10195163202404160, 216335108170636650,4653803620322450880, 101343766487960918460,2231268469684932939360, 49614581272087698764820] |