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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 44 |
| 4 | 515 |
| 5 | 7475 |
| 6 | 129525 |
| 7 | 2619384 |
| 8 | 60823498 |
| 9 | 1600232884 |
| 10 | 47150091652 |
| 11 | 1539874276303 |
| 12 | 55237696912990 |
| 13 | 2159149195744518 |
| 14 | 91335745732513695 |
| 15 | 4156560037257263852 |
| 16 | 202458583588324775958 |
| 17 | 10507835578532315131098 |
| 18 | 578860329653382364799458 |
| 19 | 33730837645131194789676597 |
| 20 | 2072763842696435360327368451 |
| 21 | 133954882943472707055024904486 |
| 22 | 9082145193772600621881071937985 |
[1,1,5,44,515,7475,129525,2619384,60823498, 1600232884,47150091652,1539874276303, 55237696912990,2159149195744518,91335745732513695, 4156560037257263852,202458583588324775958, 10507835578532315131098,578860329653382364799458, 33730837645131194789676597, 2072763842696435360327368451, 133954882943472707055024904486, 9082145193772600621881071937985] |