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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 22 |
| 3 | 479 |
| 4 | 15880 |
| 5 | 711977 |
| 6 | 40372828 |
| 7 | 2773990837 |
| 8 | 224184734080 |
| 9 | 20850884618561 |
| 10 | 2194931003624164 |
| 11 | 258095100967003445 |
| 12 | 33540797497557829360 |
| 13 | 4775042199876691978081 |
| 14 | 739225290389472515211076 |
| 15 | 123660840486107821484582093 |
| 16 | 22232061279653818569516521344 |
| 17 | 4275230842901062415074330238081 |
[1,2,22,479,15880,711977,40372828,2773990837, 224184734080,20850884618561,2194931003624164, 258095100967003445,33540797497557829360, 4775042199876691978081,739225290389472515211076, 123660840486107821484582093, 22232061279653818569516521344, 4275230842901062415074330238081] |