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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 175 |
| 5 | 4356 |
| 6 | 263424 |
| 7 | 40144896 |
| 8 | 15714084159 |
| 9 | 15953234222500 |
| 10 | 42223789335548788 |
| 11 | 292262228709213966336 |
| 12 | 5302397936652484482131200 |
| 13 | 252622720869371754406993137664 |
| 14 | 31660291085217875120800516475520000 |
| 15 | 10454334647424614439930776175842716286976 |
[1,1,3,16,175,4356,263424,40144896,15714084159, 15953234222500,42223789335548788, 292262228709213966336,5302397936652484482131200, 252622720869371754406993137664, 31660291085217875120800516475520000, 10454334647424614439930776175842716286976] |