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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 34 |
| 4 | 353 |
| 5 | 4756 |
| 6 | 80107 |
| 7 | 1617358 |
| 8 | 38145473 |
| 9 | 1029745576 |
| 10 | 31326858611 |
| 11 | 1060716408874 |
| 12 | 39571357618465 |
| 13 | 1612919873514028 |
| 14 | 71321521181852411 |
| 15 | 3400790769764598886 |
| 16 | 173950205958460627073 |
| 17 | 9501239617356541012432 |
| 18 | 551961456374529522954595 |
[1,1,5,34,353,4756,80107,1617358,38145473, 1029745576,31326858611,1060716408874, 39571357618465,1612919873514028,71321521181852411, 3400790769764598886,173950205958460627073, 9501239617356541012432,551961456374529522954595] |