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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 41 |
| 3 | 735 |
| 4 | 19293 |
| 5 | 672573 |
| 6 | 29342241 |
| 7 | 1540097541 |
| 8 | 94579646553 |
| 9 | 6656561754345 |
| 10 | 528414534842949 |
| 11 | 46716837535074897 |
| 12 | 4552821617337191637 |
| 13 | 484953672676323320109 |
| 14 | 56056228305888242732841 |
| 15 | 6988787950179969557086797 |
| 16 | 934866118278080385555647025 |
[1,4,41,735,19293,672573,29342241,1540097541, 94579646553,6656561754345,528414534842949, 46716837535074897,4552821617337191637, 484953672676323320109,56056228305888242732841, 6988787950179969557086797, 934866118278080385555647025] |