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| n | a(n) |
|---|---|
| 1 | 2497560 |
| 2 | 42777680 |
| 3 | 672221348 |
| 4 | 13775604012 |
| 5 | 268581208108 |
| 6 | 6149073639928 |
| 7 | 133204903441540 |
| 8 | 3259245492367820 |
| 9 | 74403803878824296 |
| 10 | 1896162085005376272 |
[2497560,42777680,672221348,13775604012, 268581208108,6149073639928,133204903441540, 3259245492367820,74403803878824296, 1896162085005376272] |