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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 17 |
| 3 | 111 |
| 4 | 805 |
| 5 | 6147 |
| 6 | 48641 |
| 7 | 394863 |
| 8 | 3266629 |
| 9 | 27421395 |
| 10 | 232867889 |
| 11 | 1996302447 |
| 12 | 17248208485 |
| 13 | 150013649955 |
| 14 | 1312111499105 |
| 15 | 11532737017839 |
| 16 | 101799869875717 |
| 17 | 901975446062451 |
| 18 | 8018470050567953 |
| 19 | 71496291428776815 |
| 20 | 639204721160345509 |
| 21 | 5728606469731066947 |
| 22 | 51453397357702434497 |
[1,3,17,111,805,6147,48641,394863,3266629, 27421395,232867889,1996302447,17248208485, 150013649955,1312111499105,11532737017839, 101799869875717,901975446062451,8018470050567953, 71496291428776815,639204721160345509, 5728606469731066947,51453397357702434497] |