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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 12 |
| 3 | 60 |
| 4 | 168 |
| 5 | 660 |
| 6 | 1092 |
| 7 | 2448 |
| 8 | 3420 |
| 9 | 6072 |
| 10 | 12180 |
| 11 | 14880 |
| 12 | 25308 |
| 13 | 34440 |
| 14 | 39732 |
| 15 | 51888 |
| 16 | 74412 |
| 17 | 102660 |
| 18 | 113460 |
| 19 | 150348 |
| 20 | 178920 |
| 21 | 194472 |
| 22 | 246480 |
| 23 | 285852 |
| 24 | 352440 |
| 25 | 456288 |
| 26 | 515100 |
| 27 | 546312 |
| 28 | 612468 |
| 29 | 647460 |
| 30 | 721392 |
| 31 | 1024128 |
| 32 | 1123980 |
| 33 | 1285608 |
[3,12,60,168,660,1092,2448,3420,6072,12180,14880, 25308,34440,39732,51888,74412,102660,113460, 150348,178920,194472,246480,285852,352440,456288, 515100,546312,612468,647460,721392,1024128, 1123980,1285608] |