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| n | a(n) |
|---|---|
| 1 | 3780 |
| 2 | 66960 |
| 3 | 167400 |
| 4 | 406224 |
| 5 | 1097280 |
| 6 | 6656832 |
| 7 | 13035330 |
| 8 | 29410290 |
| 9 | 4529295360 |
| 10 | 27477725184 |
| 11 | 88071903612 |
| 12 | 1159632322560 |
| 13 | 7035102756864 |
| 14 | 18554223329280 |
| 15 | 22385029489560 |
| 16 | 54934276752360 |
| 17 | 112562288197632 |
| 18 | 125356165141536 |
| 19 | 307631949813216 |
[3780,66960,167400,406224,1097280,6656832, 13035330,29410290,4529295360,27477725184, 88071903612,1159632322560,7035102756864, 18554223329280,22385029489560,54934276752360, 112562288197632,125356165141536,307631949813216] |