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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 30 |
| 5 | 372 |
| 6 | 6865 |
| 7 | 180337 |
| 8 | 6664746 |
| 9 | 347126163 |
| 10 | 25621940636 |
| 11 | 2692407417070 |
| 12 | 403782925417406 |
| 13 | 86521373592454354 |
| 14 | 26501533097131820625 |
| 15 | 11604995872798575186212 |
| 16 | 7265288737454158428096319 |
| 17 | 6503007077048714757847413184 |
| 18 | 8322734168520894445448609153627 |
[1,1,4,30,372,6865,180337,6664746,347126163, 25621940636,2692407417070,403782925417406, 86521373592454354,26501533097131820625, 11604995872798575186212,7265288737454158428096319, 6503007077048714757847413184, 8322734168520894445448609153627] |