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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 88 |
| 4 | 1425 |
| 5 | 32886 |
| 6 | 992446 |
| 7 | 37106784 |
| 8 | 1657248417 |
| 9 | 86128357150 |
| 10 | 5107663394691 |
| 11 | 340427678198400 |
| 12 | 25194445531808735 |
| 13 | 2050156960934135340 |
| 14 | 181938723871328671500 |
| 15 | 17487609556155439051136 |
| 16 | 1809886850192627028383553 |
| 17 | 200670984392566362698014110 |
| 18 | 23730570474434159458296269953 |
[1,2,9,88,1425,32886,992446,37106784,1657248417, 86128357150,5107663394691,340427678198400, 25194445531808735,2050156960934135340, 181938723871328671500,17487609556155439051136, 1809886850192627028383553, 200670984392566362698014110, 23730570474434159458296269953] |