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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 36 |
| 3 | 300 |
| 4 | 1176 |
| 5 | 7260 |
| 6 | 14196 |
| 7 | 41616 |
| 8 | 64980 |
| 9 | 139656 |
| 10 | 353220 |
| 11 | 461280 |
| 12 | 936396 |
| 13 | 1412040 |
| 14 | 1708476 |
| 15 | 2438736 |
| 16 | 3943836 |
| 17 | 6056940 |
| 18 | 6921060 |
| 19 | 10073316 |
| 20 | 12703320 |
| 21 | 14196456 |
| 22 | 19471920 |
| 23 | 23725716 |
| 24 | 31367160 |
| 25 | 44259936 |
| 26 | 52025100 |
| 27 | 56270136 |
[6,36,300,1176,7260,14196,41616,64980,139656, 353220,461280,936396,1412040,1708476,2438736, 3943836,6056940,6921060,10073316,12703320, 14196456,19471920,23725716,31367160,44259936, 52025100,56270136] |