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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 21 |
| 4 | 382 |
| 5 | 17578 |
| 6 | 1755243 |
| 7 | 402968942 |
| 8 | 207573951234 |
| 9 | 242284444195349 |
| 10 | 638096588519781536 |
| 11 | 3798652903378388363280 |
| 12 | 51076133156779686951912785 |
| 13 | 1551660182965034835583479000348 |
| 14 | 106488245934766828340647881986248382 |
[1,2,21,382,17578,1755243,402968942,207573951234, 242284444195349,638096588519781536, 3798652903378388363280,51076133156779686951912785, 1551660182965034835583479000348, 106488245934766828340647881986248382] |