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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 72 |
| 3 | 4608 |
| 4 | 52488 |
| 5 | 294912 |
| 6 | 1125000 |
| 7 | 3359232 |
| 8 | 8470728 |
| 9 | 18874368 |
| 10 | 38263752 |
| 11 | 72000000 |
| 12 | 127552392 |
| 13 | 214990848 |
| 14 | 347530248 |
| 15 | 542126592 |
| 16 | 820125000 |
| 17 | 1207959552 |
| 18 | 1737904968 |
| 19 | 2448880128 |
| 20 | 3387303432 |
| 21 | 4608000000 |
| 22 | 6175160712 |
| 23 | 8163353088 |
| 24 | 10658584008 |
| 25 | 13759414272 |
| 26 | 17578125000 |
[0,72,4608,52488,294912,1125000,3359232,8470728, 18874368,38263752,72000000,127552392,214990848, 347530248,542126592,820125000,1207959552, 1737904968,2448880128,3387303432,4608000000, 6175160712,8163353088,10658584008,13759414272, 17578125000] |