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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 54 |
| 5 | 610 |
| 6 | 7575 |
| 7 | 124005 |
| 8 | 1721692 |
| 9 | 21584676 |
| 10 | 254430555 |
| 11 | 2752913955 |
| 12 | 27276416970 |
| 13 | 252510790038 |
| 14 | 2245919946361 |
| 15 | 19423497389310 |
| 16 | 163254969718200 |
| 17 | 1331429118674408 |
| 18 | 10524020807274019 |
| 19 | 80607360684092143 |
| 20 | 599129356328684230 |
[1,3,54,610,7575,124005,1721692,21584676, 254430555,2752913955,27276416970,252510790038, 2245919946361,19423497389310,163254969718200, 1331429118674408,10524020807274019, 80607360684092143,599129356328684230] |