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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 1 |
| 3 | 2 |
| 4 | 10 |
| 5 | 700 |
| 6 | 700 |
| 7 | 9800 |
| 8 | 3185000 |
| 9 | 85358000 |
| 10 | 1484210000 |
| 11 | 4904900000 |
| 12 | 213514756000 |
| 13 | 10932576200000 |
| 14 | 651421552600000 |
| 15 | 491216647558000000 |
| 16 | 59347135259594000000 |
| 17 | 308654469531044000000 |
| 18 | 582291574342534420000000 |
| 19 | 3395537788696824680000000 |
[2,1,2,10,700,700,9800,3185000,85358000, 1484210000,4904900000,213514756000,10932576200000, 651421552600000,491216647558000000, 59347135259594000000,308654469531044000000, 582291574342534420000000, 3395537788696824680000000] |