The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 1 |
| 3 | 120 |
| 4 | 20 |
| 5 | 1 |
| 6 | 1560 |
| 7 | 340 |
| 8 | 30 |
| 9 | 1 |
| 10 | 21216 |
| 11 | 5520 |
| 12 | 660 |
| 13 | 40 |
| 14 | 1 |
| 15 | 297024 |
| 16 | 88032 |
| 17 | 12880 |
| 18 | 1080 |
| 19 | 50 |
| 20 | 1 |
| 21 | 4243200 |
| 22 | 1392768 |
| 23 | 236448 |
| 24 | 24640 |
| 25 | 1600 |
| 26 | 60 |
| 27 | 1 |
| 28 | 61526400 |
| 29 | 21952320 |
| 30 | 4187232 |
| 31 | 512464 |
| 32 | 41800 |
| 33 | 2220 |
| 34 | 70 |
| 35 | 1 |
| 36 | 902387200 |
| 37 | 345396480 |
| 38 | 72452160 |
| 39 | 10060416 |
[1,10,1,120,20,1,1560,340,30,1,21216,5520,660,40, 1,297024,88032,12880,1080,50,1,4243200,1392768, 236448,24640,1600,60,1,61526400,21952320,4187232, 512464,41800,2220,70,1,902387200,345396480, 72452160,10060416] |