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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 32 |
| 3 | 275 |
| 4 | 1763 |
| 5 | 12421 |
| 6 | 85808 |
| 7 | 561074 |
| 8 | 3535678 |
| 9 | 21815897 |
| 10 | 131733641 |
| 11 | 778099521 |
| 12 | 4505634324 |
| 13 | 25635135074 |
| 14 | 143507764032 |
| 15 | 791243636305 |
| 16 | 4300983535471 |
| 17 | 23070300486656 |
| 18 | 122213931799869 |
| 19 | 639848848696540 |
| 20 | 3312824859756453 |
| 21 | 16972058378914997 |
| 22 | 86082216143323410 |
[1,1,32,275,1763,12421,85808,561074,3535678, 21815897,131733641,778099521,4505634324, 25635135074,143507764032,791243636305, 4300983535471,23070300486656,122213931799869, 639848848696540,3312824859756453, 16972058378914997,86082216143323410] |