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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 13 |
| 3 | 156 |
| 4 | 2833 |
| 5 | 70098 |
| 6 | 2214280 |
| 7 | 85464984 |
| 8 | 3906724321 |
| 9 | 206648387550 |
| 10 | 12425282899588 |
| 11 | 837384222603448 |
| 12 | 62539219710804627 |
| 13 | 5127758187193514824 |
| 14 | 457986530357734020432 |
| 15 | 44263628968974498793648 |
| 16 | 4602969726808566383149761 |
| 17 | 512486177498084438210961270 |
| 18 | 60827938291895363867587959628 |
[1,2,13,156,2833,70098,2214280,85464984, 3906724321,206648387550,12425282899588, 837384222603448,62539219710804627, 5127758187193514824,457986530357734020432, 44263628968974498793648,4602969726808566383149761, 512486177498084438210961270, 60827938291895363867587959628] |