The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 4 |
| 6 | 60 |
| 7 | 6 |
| 8 | 84 |
| 9 | 24 |
| 10 | 360 |
| 11 | 10 |
| 12 | 3960 |
| 13 | 12 |
| 14 | 1092 |
| 15 | 420 |
| 16 | 840 |
| 17 | 16 |
| 18 | 12240 |
| 19 | 18 |
| 20 | 13680 |
| 21 | 1260 |
| 22 | 4620 |
| 23 | 22 |
| 24 | 1275120 |
| 25 | 120 |
| 26 | 7800 |
| 27 | 936 |
| 28 | 19656 |
| 29 | 28 |
| 30 | 1096200 |
| 31 | 30 |
| 32 | 52080 |
| 33 | 5280 |
| 34 | 17952 |
| 35 | 7140 |
| 36 | 5654880 |
| 37 | 36 |
| 38 | 25308 |
| 39 | 8892 |
| 40 | 2489760 |
| 41 | 40 |
| 42 | 1343160 |
| 43 | 42 |
| 44 | 397320 |
| 45 | 27720 |
[1,1,2,6,4,60,6,84,24,360,10,3960,12,1092,420,840, 16,12240,18,13680,1260,4620,22,1275120,120,7800, 936,19656,28,1096200,30,52080,5280,17952,7140, 5654880,36,25308,8892,2489760,40,1343160,42, 397320,27720] |