The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 2 |
| 4 | 7 |
| 5 | 21 |
| 6 | 42 |
| 7 | 48 |
| 8 | 18 |
| 9 | 26 |
| 10 | 234 |
| 11 | 2808 |
| 12 | 6552 |
| 13 | 7056 |
| 14 | 12096 |
| 15 | 96768 |
| 16 | 187488 |
| 17 | 3374784 |
| 18 | 7312032 |
| 19 | 29248128 |
| 20 | 307105344 |
| 21 | 467970048 |
| 22 | 8423460864 |
| 23 | 202163060736 |
| 24 | 101081530368 |
| 25 | 3133527441408 |
| 26 | 5061852020736 |
| 27 | 1499808006144 |
| 28 | 2999616012288 |
| 29 | 17997696073728 |
| 30 | 215972352884736 |
[1,3,2,7,21,42,48,18,26,234,2808,6552,7056,12096, 96768,187488,3374784,7312032,29248128,307105344, 467970048,8423460864,202163060736,101081530368, 3133527441408,5061852020736,1499808006144, 2999616012288,17997696073728,215972352884736] |