The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 1 |
| 5 | 6 |
| 6 | 12 |
| 7 | 1 |
| 8 | 12 |
| 9 | 60 |
| 10 | 128 |
| 11 | 18 |
| 12 | 1 |
| 13 | 20 |
| 14 | 180 |
| 15 | 880 |
| 16 | 2090 |
| 17 | 960 |
| 18 | 100 |
| 19 | 1 |
| 20 | 30 |
| 21 | 420 |
| 22 | 3480 |
| 23 | 17550 |
| 24 | 47772 |
| 25 | 43920 |
| 26 | 15000 |
| 27 | 1710 |
| 28 | 140 |
| 29 | 1 |
| 30 | 42 |
| 31 | 840 |
| 32 | 10360 |
| 33 | 84630 |
| 34 | 452004 |
| 35 | 1428868 |
| 36 | 2094960 |
| 37 | 1465170 |
| 38 | 491540 |
| 39 | 90594 |
| 40 | 10080 |
| 41 | 770 |
[1,1,2,1,6,12,1,12,60,128,18,1,20,180,880,2090, 960,100,1,30,420,3480,17550,47772,43920,15000, 1710,140,1,42,840,10360,84630,452004,1428868, 2094960,1465170,491540,90594,10080,770] |