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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 54 |
| 4 | 512 |
| 5 | 9375 |
| 6 | 186624 |
| 7 | 4117715 |
| 8 | 100663296 |
| 9 | 3099363912 |
| 10 | 100000000000 |
| 11 | 3423740047332 |
| 12 | 133741506723840 |
| 13 | 5451751918660554 |
| 14 | 244464150162276352 |
| 15 | 11823135040283203125 |
| 16 | 590295810358705651712 |
| 17 | 31435129951680797038726 |
| 18 | 1809934771463640728469504 |
[1,1,4,54,512,9375,186624,4117715,100663296, 3099363912,100000000000,3423740047332, 133741506723840,5451751918660554, 244464150162276352,11823135040283203125, 590295810358705651712,31435129951680797038726, 1809934771463640728469504] |