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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 46 |
| 4 | 1066 |
| 5 | 41506 |
| 6 | 2441314 |
| 7 | 202229266 |
| 8 | 22447207906 |
| 9 | 3216941445106 |
| 10 | 578333776748674 |
| 11 | 127464417117501586 |
| 12 | 33800841048945424546 |
| 13 | 10617398393395844992306 |
| 14 | 3898852051843774954576834 |
| 15 | 1654948033478889053351543506 |
| 16 | 804119629083230641164978005986 |
[1,1,4,46,1066,41506,2441314,202229266, 22447207906,3216941445106,578333776748674, 127464417117501586,33800841048945424546, 10617398393395844992306,3898852051843774954576834, 1654948033478889053351543506, 804119629083230641164978005986] |