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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 17 |
| 3 | 124 |
| 4 | 1030 |
| 5 | 9251 |
| 6 | 87517 |
| 7 | 859099 |
| 8 | 8669363 |
| 9 | 89378119 |
| 10 | 937338385 |
| 11 | 9968284525 |
| 12 | 107246775281 |
| 13 | 1165214293500 |
| 14 | 12766501347012 |
| 15 | 140894107553484 |
| 16 | 1564845156329626 |
| 17 | 17477561474851094 |
| 18 | 196177569785319286 |
| 19 | 2211811995984100253 |
| 20 | 25037053775934416711 |
| 21 | 284438311913461647139 |
[1,3,17,124,1030,9251,87517,859099,8669363, 89378119,937338385,9968284525,107246775281, 1165214293500,12766501347012,140894107553484, 1564845156329626,17477561474851094, 196177569785319286,2211811995984100253, 25037053775934416711,284438311913461647139] |