The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 216 |
| 5 | 255 |
| 6 | 1080 |
| 7 | 1728 |
| 8 | 8640 |
| 9 | 18360 |
| 10 | 19344 |
| 11 | 65535 |
| 12 | 146880 |
| 13 | 182880 |
| 14 | 309504 |
| 15 | 1226400 |
| 16 | 2967888 |
| 17 | 3456000 |
| 18 | 4718520 |
| 19 | 7132320 |
| 20 | 14738400 |
| 21 | 22866096 |
| 22 | 23408640 |
| 23 | 37748160 |
| 24 | 46835712 |
| 25 | 47486208 |
| 26 | 58752000 |
| 27 | 76658400 |
| 28 | 79233024 |
| 29 | 124416000 |
| 30 | 174182400 |
| 31 | 297198720 |
[1,3,15,216,255,1080,1728,8640,18360,19344,65535, 146880,182880,309504,1226400,2967888,3456000, 4718520,7132320,14738400,22866096,23408640, 37748160,46835712,47486208,58752000,76658400, 79233024,124416000,174182400,297198720] |