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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 473 |
| 3 | 467606 |
| 4 | 637121154 |
| 5 | 1039792179805 |
| 6 | 1905441263652576 |
| 7 | 3785382599457953517 |
| 8 | 7981116324798212651066 |
| 9 | 17613760342120835610374245 |
| 10 | 40303877398793645855018120732 |
| 11 | 94970269248783993542201925505548 |
| 12 | 229287077006842005926064077532676555 |
| 13 | 565001770629439341048001870559581136157 |
[1,1,473,467606,637121154,1039792179805, 1905441263652576,3785382599457953517, 7981116324798212651066,17613760342120835610374245, 40303877398793645855018120732, 94970269248783993542201925505548, 229287077006842005926064077532676555, 565001770629439341048001870559581136157] |