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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 33 |
| 4 | 436 |
| 5 | 8185 |
| 6 | 206046 |
| 7 | 6622945 |
| 8 | 263313688 |
| 9 | 12627149265 |
| 10 | 716160702970 |
| 11 | 47284266221401 |
| 12 | 3587061106583604 |
| 13 | 309251317536586633 |
| 14 | 30017652739792964806 |
| 15 | 3254137305364883664945 |
| 16 | 391238883136463492841136 |
| 17 | 51846176797206158144925985 |
[1,1,4,33,436,8185,206046,6622945,263313688, 12627149265,716160702970,47284266221401, 3587061106583604,309251317536586633, 30017652739792964806,3254137305364883664945, 391238883136463492841136, 51846176797206158144925985] |