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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 1 |
| 4 | 12 |
| 5 | 20 |
| 6 | 1 |
| 7 | 30 |
| 8 | 300 |
| 9 | 488 |
| 10 | 1 |
| 11 | 56 |
| 12 | 1400 |
| 13 | 13664 |
| 14 | 22160 |
| 15 | 1 |
| 16 | 90 |
| 17 | 4200 |
| 18 | 102480 |
| 19 | 997200 |
| 20 | 1616672 |
| 21 | 1 |
| 22 | 132 |
| 23 | 9900 |
| 24 | 450912 |
| 25 | 10969200 |
| 26 | 106700352 |
| 27 | 172976960 |
| 28 | 1 |
| 29 | 182 |
| 30 | 20020 |
| 31 | 1465464 |
| 32 | 66546480 |
| 33 | 1618288672 |
| 34 | 15740903360 |
| 35 | 25518205568 |
[1,1,2,1,12,20,1,30,300,488,1,56,1400,13664,22160, 1,90,4200,102480,997200,1616672,1,132,9900,450912, 10969200,106700352,172976960,1,182,20020,1465464, 66546480,1618288672,15740903360,25518205568] |