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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 36 |
| 3 | 60 |
| 4 | 144 |
| 5 | 324 |
| 6 | 756 |
| 7 | 1728 |
| 8 | 3996 |
| 9 | 9180 |
| 10 | 21168 |
| 11 | 48708 |
| 12 | 112212 |
| 13 | 258336 |
| 14 | 594972 |
| 15 | 1369980 |
| 16 | 3154896 |
| 17 | 7264836 |
| 18 | 16729524 |
| 19 | 38524032 |
| 20 | 88712604 |
| 21 | 204284700 |
| 22 | 470422512 |
| 23 | 1083276612 |
| 24 | 2494544148 |
| 25 | 5744373984 |
| 26 | 13228006428 |
| 27 | 30461128380 |
| 28 | 70145147664 |
[6,36,60,144,324,756,1728,3996,9180,21168,48708, 112212,258336,594972,1369980,3154896,7264836, 16729524,38524032,88712604,204284700,470422512, 1083276612,2494544148,5744373984,13228006428, 30461128380,70145147664] |