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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 2 |
| 3 | 21 |
| 4 | 24 |
| 5 | 8 |
| 6 | 885 |
| 7 | 2016 |
| 8 | 1824 |
| 9 | 768 |
| 10 | 128 |
| 11 | 1566453 |
| 12 | 7136640 |
| 13 | 14585472 |
| 14 | 17427456 |
| 15 | 13300224 |
| 16 | 6635520 |
| 17 | 2113536 |
| 18 | 393216 |
| 19 | 32768 |
| 20 | 4907550002421 |
| 21 | 44716844551680 |
| 22 | 193253086462464 |
| 23 | 525562214510592 |
| 24 | 1006302608418816 |
| 25 | 1438003249348608 |
| 26 | 1586056913289216 |
[1,3,2,21,24,8,885,2016,1824,768,128,1566453, 7136640,14585472,17427456,13300224,6635520, 2113536,393216,32768,4907550002421,44716844551680, 193253086462464,525562214510592,1006302608418816, 1438003249348608,1586056913289216] |