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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 12 |
| 3 | 249 |
| 4 | 9184 |
| 5 | 488745 |
| 6 | 35463456 |
| 7 | 3212948809 |
| 8 | 369653885952 |
| 9 | 52089606360081 |
| 10 | 8863922597593600 |
| 11 | 1752215974571247801 |
| 12 | 402913941534323970048 |
| 13 | 106177876504463493003001 |
| 14 | 31939024924944619647750144 |
| 15 | 10756222724503803551432639625 |
| 16 | 4050020577581980281160989147136 |
[1,1,12,249,9184,488745,35463456,3212948809, 369653885952,52089606360081,8863922597593600, 1752215974571247801,402913941534323970048, 106177876504463493003001, 31939024924944619647750144, 10756222724503803551432639625, 4050020577581980281160989147136] |