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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 60 |
| 3 | 240 |
| 4 | 13308 |
| 5 | 52992 |
| 6 | 53052 |
| 7 | 53196 |
| 8 | 3195132 |
| 9 | 3208140 |
| 10 | 3346188 |
| 11 | 12795648 |
| 12 | 12795900 |
| 13 | 871563264 |
| 14 | 871563312 |
| 15 | 871563456 |
| 16 | 871576368 |
| 17 | 871576380 |
| 18 | 871576524 |
| 19 | 871615728 |
| 20 | 871616268 |
| 21 | 871616448 |
| 22 | 1072939776 |
| 23 | 1072939788 |
| 24 | 1072939824 |
| 25 | 3225157884 |
| 26 | 3472949196 |
| 27 | 3473670912 |
[0,60,240,13308,52992,53052,53196,3195132,3208140, 3346188,12795648,12795900,871563264,871563312, 871563456,871576368,871576380,871576524,871615728, 871616268,871616448,1072939776,1072939788, 1072939824,3225157884,3472949196,3473670912] |