The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 3 | 2 |
| 4 | 3 |
| 5 | 12 |
| 6 | 5 |
| 7 | 60 |
| 8 | 35 |
| 9 | 280 |
| 10 | 63 |
| 11 | 2520 |
| 12 | 77 |
| 13 | 27720 |
| 14 | 1287 |
| 15 | 8008 |
| 16 | 6435 |
| 17 | 144144 |
| 18 | 2431 |
| 19 | 2450448 |
| 20 | 46189 |
| 21 | 3695120 |
| 22 | 146965 |
| 23 | 232792560 |
| 24 | 96577 |
| 25 | 1070845776 |
| 26 | 1300075 |
| 27 | 2974571600 |
| 28 | 5014575 |
| 29 | 11473347600 |
| 30 | 215441 |
| 31 | 332727080400 |
| 32 | 31556720475 |
| 33 | 486207248800 |
| 34 | 20419054425 |
[2,3,12,5,60,35,280,63,2520,77,27720,1287,8008, 6435,144144,2431,2450448,46189,3695120,146965, 232792560,96577,1070845776,1300075,2974571600, 5014575,11473347600,215441,332727080400, 31556720475,486207248800,20419054425] |